WIP: Allocate landed cost.

2026-02-15 20:30:33 +00:00 · 2021-07-22 18:11:17 +02:00
parent 1eacc254d8
commit 76c6cb3699
33 changed files with 1577 additions and 163 deletions
--- a/server/src/api/controllers/Expenses.ts
+++ b/server/src/api/controllers/Expenses.ts
@@ -111,6 +111,7 @@ export default class ExpensesController extends BaseController {
        .trim()
        .escape()
        .isLength({ max: DATATYPES_LENGTH.STRING }),
+      check('categories.*.landed_cost').optional().isBoolean().toBoolean(),
    ];
  }

@@ -251,11 +252,8 @@ export default class ExpensesController extends BaseController {
    }

    try {
-      const {
-        expenses,
-        pagination,
-        filterMeta,
-      } = await this.expensesService.getExpensesList(tenantId, filter);
+      const { expenses, pagination, filterMeta } =
+        await this.expensesService.getExpensesList(tenantId, filter);

      return res.status(200).send({
        expenses,
@@ -345,6 +343,11 @@ export default class ExpensesController extends BaseController {
          errors: [{ type: 'CONTACT_NOT_FOUND', code: 800 }],
        });
      }
+      if (error.errorType === 'EXPENSE_HAS_ASSOCIATED_LANDED_COST') {
+        return res.status(400).send({
+          errors: [{ type: 'EXPENSE_HAS_ASSOCIATED_LANDED_COST', code: 900 }],
+        });
+      }
    }
    next(error);
  }
--- a/server/src/api/controllers/Purchases/Bills.ts
+++ b/server/src/api/controllers/Purchases/Bills.ts
@@ -110,6 +110,10 @@ export default class BillsController extends BaseController {
        .optional({ nullable: true })
        .trim()
        .escape(),
+      check('entries.*.landed_cost')
+        .optional({ nullable: true })
+        .isBoolean()
+        .toBoolean(),
    ];
  }

@@ -141,6 +145,10 @@ export default class BillsController extends BaseController {
        .optional({ nullable: true })
        .trim()
        .escape(),
+      check('entries.*.landedCost')
+        .optional({ nullable: true })
+        .isBoolean()
+        .toBoolean(),
    ];
  }

@@ -301,11 +309,8 @@ export default class BillsController extends BaseController {
      filter.filterRoles = JSON.parse(filter.stringifiedFilterRoles);
    }
    try {
-      const {
-        bills,
-        pagination,
-        filterMeta,
-      } = await this.billsService.getBills(tenantId, filter);
+      const { bills, pagination, filterMeta } =
+        await this.billsService.getBills(tenantId, filter);

      return res.status(200).send({
        bills,
@@ -397,17 +402,24 @@ export default class BillsController extends BaseController {
      if (error.errorType === 'contact_not_found') {
        return res.boom.badRequest(null, {
          errors: [
-            { type: 'VENDOR_NOT_FOUND', message: 'Vendor not found.', code: 1200 },
+            {
+              type: 'VENDOR_NOT_FOUND',
+              message: 'Vendor not found.',
+              code: 1200,
+            },
          ],
        });
      }
      if (error.errorType === 'BILL_HAS_ASSOCIATED_PAYMENT_ENTRIES') {
        return res.status(400).send({
-          errors: [{
-            type: 'BILL_HAS_ASSOCIATED_PAYMENT_ENTRIES',
-            message: 'Cannot delete bill that has associated payment transactions.',
-            code: 1200
-          }],
+          errors: [
+            {
+              type: 'BILL_HAS_ASSOCIATED_PAYMENT_ENTRIES',
+              message:
+                'Cannot delete bill that has associated payment transactions.',
+              code: 1200,
+            },
+          ],
        });
      }
    }
--- a/server/src/api/controllers/Purchases/LandedCost.ts
+++ b/server/src/api/controllers/Purchases/LandedCost.ts
@@ -0,0 +1,289 @@
+import { Router, Request, Response, NextFunction } from 'express';
+import { check, param, query } from 'express-validator';
+import { Service, Inject } from 'typedi';
+import { ServiceError } from 'exceptions';
+import AllocateLandedCostService from 'services/Purchases/LandedCost';
+import LandedCostListing from 'services/Purchases/LandedCost/LandedCostListing';
+import BaseController from '../BaseController';
+import { ResultSetDependencies } from 'mathjs';
+
+@Service()
+export default class BillAllocateLandedCost extends BaseController {
+  @Inject()
+  allocateLandedCost: AllocateLandedCostService;
+
+  @Inject()
+  landedCostListing: LandedCostListing;
+
+  /**
+   * Router constructor.
+   */
+  public router() {
+    const router = Router();
+
+    router.post(
+      '/bills/:billId/allocate',
+      [
+        check('transaction_id').exists().isInt(),
+        check('transaction_type').exists().isIn(['Expense', 'Bill']),
+        check('transaction_entry_id').exists().isInt(),
+
+        check('allocation_method').exists().isIn(['value', 'quantity']),
+        check('description').optional({ nullable: true }),
+
+        check('items').isArray({ min: 1 }),
+        check('items.*.entry_id').isInt(),
+        check('items.*.cost').isDecimal(),
+      ],
+      this.validationResult,
+      this.calculateLandedCost.bind(this),
+      this.handleServiceErrors
+    );
+    router.delete(
+      '/:allocatedLandedCostId',
+      [param('allocatedLandedCostId').exists().isInt()],
+      this.validationResult,
+      this.deleteAllocatedLandedCost.bind(this),
+      this.handleServiceErrors
+    );
+    router.get(
+      '/transactions',
+      [query('transaction_type').exists().isIn(['Expense', 'Bill'])],
+      this.validationResult,
+      this.getLandedCostTransactions.bind(this),
+      this.handleServiceErrors
+    );
+    router.get(
+      '/bills/:billId/transactions',
+      [param('billId').exists()],
+      this.validationResult,
+      this.getBillLandedCostTransactions.bind(this),
+      this.handleServiceErrors
+    );
+    return router;
+  }
+
+  /**
+   * Retrieve the landed cost transactions of the given query.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   */
+  private async getLandedCostTransactions(
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ) {
+    const { tenantId } = req;
+    const query = this.matchedQueryData(req);
+
+    try {
+      const transactions =
+        await this.landedCostListing.getLandedCostTransactions(tenantId, query);
+      return res.status(200).send({ transactions });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Allocate landed cost.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   * @returns {Response}
+   */
+  public async calculateLandedCost(
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ) {
+    const { tenantId } = req;
+    const { billId: purchaseInvoiceId } = req.params;
+    const landedCostDTO = this.matchedBodyData(req);
+
+    try {
+      const { billLandedCost } =
+        await this.allocateLandedCost.allocateLandedCost(
+          tenantId,
+          landedCostDTO,
+          purchaseInvoiceId
+        );
+
+      return res.status(200).send({
+        id: billLandedCost.id,
+        message: 'The items cost are located successfully.',
+      });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Deletes the allocated landed cost.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   * @returns {Response}
+   */
+  public async deleteAllocatedLandedCost(
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ): Promise<Response> {
+    const { tenantId } = req;
+    const { allocatedLandedCostId } = req.params;
+
+    try {
+      await this.allocateLandedCost.deleteAllocatedLandedCost(
+        tenantId,
+        allocatedLandedCostId
+      );
+
+      return res.status(200).send({
+        id: allocatedLandedCostId,
+        message: 'The allocated landed cost are delete successfully.',
+      });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Retrieve the list unlocated landed costs.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   */
+  public async listLandedCosts(
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ) {
+    const query = this.matchedQueryData(req);
+    const { tenantId } = req;
+
+    try {
+      const transactions =
+        await this.landedCostListing.getLandedCostTransactions(tenantId, query);
+      return res.status(200).send({ transactions });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Retrieve the bill landed cost transactions.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   */
+  public async getBillLandedCostTransactions(
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ): Promise<Response> {
+    const { tenantId } = req;
+    const { billId } = req.params;
+
+    try {
+      const transactions =
+        await this.landedCostListing.getBillLandedCostTransactions(
+          tenantId,
+          billId
+        );
+
+      return res.status(200).send({
+        billId,
+        transactions,
+      });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Handle service errors.
+   * @param {Request} req
+   * @param {Response} res
+   * @param {NextFunction} next
+   * @param {Error} error
+   */
+  public handleServiceErrors(
+    error: Error,
+    req: Request,
+    res: Response,
+    next: NextFunction
+  ) {
+    if (error instanceof ServiceError) {
+      if (error.errorType === 'BILL_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [
+            {
+              type: 'BILL_NOT_FOUND',
+              code: 400,
+              message: 'The give bill id not found.',
+            },
+          ],
+        });
+      }
+      if (error.errorType === 'LANDED_COST_TRANSACTION_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [
+            {
+              type: 'LANDED_COST_TRANSACTION_NOT_FOUND',
+              code: 200,
+              message: 'The given landed cost transaction id not found.',
+            },
+          ],
+        });
+      }
+      if (error.errorType === 'LANDED_COST_ENTRY_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [
+            {
+              type: 'LANDED_COST_ENTRY_NOT_FOUND',
+              code: 300,
+              message: 'The given landed cost tranasction entry id not found.',
+            },
+          ],
+        });
+      }
+      if (error.errorType === 'COST_AMOUNT_BIGGER_THAN_UNALLOCATED_AMOUNT') {
+        return res.status(400).send({
+          errors: [
+            { type: 'COST_AMOUNT_BIGGER_THAN_UNALLOCATED_AMOUNT', code: 300 },
+          ],
+        });
+      }
+      if (error.errorType === 'LANDED_COST_ITEMS_IDS_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [
+            {
+              type: 'LANDED_COST_ITEMS_IDS_NOT_FOUND',
+              code: 200,
+              message: 'The given entries ids of purchase invoice not found.',
+            },
+          ],
+        });
+      }
+      if (error.errorType === 'BILL_LANDED_COST_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [
+            {
+              type: 'BILL_LANDED_COST_NOT_FOUND',
+              code: 200,
+              message: 'The given bill located landed cost not found.',
+            },
+          ],
+        });
+      }
+      if (error.errorType === 'COST_TRASNACTION_NOT_FOUND') {
+        return res.status(400).send({
+          errors: [{ type: 'COST_TRASNACTION_NOT_FOUND', code: 500 }],
+        });
+      }
+    }
+    next(error);
+  }
+}
--- a/server/src/api/controllers/Purchases/index.ts
+++ b/server/src/api/controllers/Purchases/index.ts
@@ -2,6 +2,7 @@ import { Router } from 'express';
 import { Container, Service } from 'typedi';
 import Bills from 'api/controllers/Purchases/Bills'
 import BillPayments from 'api/controllers/Purchases/BillsPayments';
+import BillAllocateLandedCost from './LandedCost';

@Service()
 export default class PurchasesController {
@@ -11,6 +12,7 @@ export default class PurchasesController {

    router.use('/bills', Container.get(Bills).router());
    router.use('/bill_payments', Container.get(BillPayments).router());
+    router.use('/landed-cost', Container.get(BillAllocateLandedCost).router());

    return router;
  }
--- a/server/src/api/controllers/Sales/SalesInvoices.ts
+++ b/server/src/api/controllers/Sales/SalesInvoices.ts
@@ -347,7 +347,7 @@ export default class SaleInvoicesController extends BaseController {
   * @param {Response} res
   * @param {NextFunction} next
   */
-  handleServiceErrors(
+  private handleServiceErrors(
    error: Error,
    req: Request,
    res: Response,
--- a/server/src/database/migrations/20190822214306_create_items_table.js
+++ b/server/src/database/migrations/20190822214306_create_items_table.js
@@ -17,6 +17,7 @@ exports.up = function (knex) {
    table.text('sell_description').nullable();
    table.text('purchase_description').nullable();
    table.integer('quantity_on_hand');
+    table.boolean('landed_cost').nullable();

    table.text('note').nullable();
    table.boolean('active');
--- a/server/src/database/migrations/20200105014405_create_expenses_table.js
+++ b/server/src/database/migrations/20200105014405_create_expenses_table.js
@@ -1,20 +1,29 @@
+exports.up = function (knex) {
+  return knex.schema
+    .createTable('expenses_transactions', (table) => {
+      table.increments();
+      table.string('currency_code', 3);
+      table.text('description');
+      table
+        .integer('payment_account_id')
+        .unsigned()
+        .references('id')
+        .inTable('accounts');
+      table.integer('payee_id').unsigned().references('id').inTable('contacts');
+      table.string('reference_no');

-exports.up = function(knex) {
-  return knex.schema.createTable('expenses_transactions', (table) => {
-    table.increments();
-    table.decimal('total_amount', 13, 3);
-    table.string('currency_code', 3);
-    table.text('description');
-    table.integer('payment_account_id').unsigned().references('id').inTable('accounts');
-    table.integer('payee_id').unsigned().references('id').inTable('contacts');;
-    table.string('reference_no');
-    table.date('published_at').index();
-    table.integer('user_id').unsigned().index();
-    table.date('payment_date').index();
-    table.timestamps();
-  }).raw('ALTER TABLE `EXPENSES_TRANSACTIONS` AUTO_INCREMENT = 1000');
+      table.decimal('total_amount', 13, 3);
+      table.decimal('landed_cost_amount', 13, 3).defaultTo(0);
+      table.decimal('allocated_cost_amount', 13, 3).defaultTo(0);
+
+      table.date('published_at').index();
+      table.integer('user_id').unsigned().index();
+      table.date('payment_date').index();
+      table.timestamps();
+    })
+    .raw('ALTER TABLE `EXPENSES_TRANSACTIONS` AUTO_INCREMENT = 1000');
 };

-exports.down = function(knex) {
+exports.down = function (knex) {
  return knex.schema.dropTableIfExists('expenses');
 };
--- a/server/src/database/migrations/20200606113848_create_expense_transactions_categories_table.js
+++ b/server/src/database/migrations/20200606113848_create_expense_transactions_categories_table.js
@@ -1,16 +1,29 @@
-
-exports.up = function(knex) {
-  return knex.schema.createTable('expense_transaction_categories', table => {
-    table.increments();
-    table.integer('expense_account_id').unsigned().index().references('id').inTable('accounts');
-    table.integer('index').unsigned();
-    table.text('description');
-    table.decimal('amount', 13, 3);
-    table.integer('expense_id').unsigned().index().references('id').inTable('expenses_transactions');
-    table.timestamps();
-  }).raw('ALTER TABLE `EXPENSE_TRANSACTION_CATEGORIES` AUTO_INCREMENT = 1000');;
+exports.up = function (knex) {
+  return knex.schema
+    .createTable('expense_transaction_categories', (table) => {
+      table.increments();
+      table
+        .integer('expense_account_id')
+        .unsigned()
+        .index()
+        .references('id')
+        .inTable('accounts');
+      table.integer('index').unsigned();
+      table.text('description');
+      table.decimal('amount', 13, 3);
+      table.decimal('allocated_cost_amount', 13, 3).defaultTo(0);
+      table.boolean('landed_cost').defaultTo(false);
+      table
+        .integer('expense_id')
+        .unsigned()
+        .index()
+        .references('id')
+        .inTable('expenses_transactions');
+      table.timestamps();
+    })
+    .raw('ALTER TABLE `EXPENSE_TRANSACTION_CATEGORIES` AUTO_INCREMENT = 1000');
 };

-exports.down = function(knex) {
+exports.down = function (knex) {
  return knex.schema.dropTableIfExists('expense_transaction_categories');
 };
--- a/server/src/database/migrations/20200719152005_create_bills_table.js
+++ b/server/src/database/migrations/20200719152005_create_bills_table.js
@@ -1,8 +1,12 @@
-
-exports.up = function(knex) {
+exports.up = function (knex) {
  return knex.schema.createTable('bills', (table) => {
    table.increments();
-    table.integer('vendor_id').unsigned().index().references('id').inTable('contacts');
+    table
+      .integer('vendor_id')
+      .unsigned()
+      .index()
+      .references('id')
+      .inTable('contacts');
    table.string('bill_number');
    table.date('bill_date').index();
    table.date('due_date').index();
@@ -12,6 +16,8 @@ exports.up = function(knex) {
    table.decimal('amount', 13, 3).defaultTo(0);
    table.string('currency_code');
    table.decimal('payment_amount', 13, 3).defaultTo(0);
+    table.decimal('landed_cost_amount', 13, 3).defaultTo(0);
+    table.decimal('allocated_cost_amount', 13, 3).defaultTo(0);
    table.string('inv_lot_number').index();
    table.date('opened_at').index();
    table.integer('user_id').unsigned();
@@ -19,6 +25,6 @@ exports.up = function(knex) {
  });
 };

-exports.down = function(knex) {
+exports.down = function (knex) {
  return knex.schema.dropTableIfExists('bills');
 };
--- a/server/src/database/migrations/20200722164252_create_landed_cost_table.js
+++ b/server/src/database/migrations/20200722164252_create_landed_cost_table.js
@@ -0,0 +1,21 @@
+exports.up = function (knex) {
+  return knex.schema.createTable('bill_located_costs', (table) => {
+    table.increments();
+
+    table.decimal('amount', 13, 3).unsigned();
+
+    table.integer('fromTransactionId').unsigned();
+    table.string('fromTransactionType');
+    table.integer('fromTransactionEntryId').unsigned();
+
+    table.string('allocationMethod');
+    table.integer('costAccountId').unsigned();
+    table.text('description');
+
+    table.integer('billId').unsigned();
+
+    table.timestamps();
+  });
+};
+
+exports.down = function (knex) {};
--- a/server/src/database/migrations/20200722164253_create_landed_cost_entries_table.js
+++ b/server/src/database/migrations/20200722164253_create_landed_cost_entries_table.js
@@ -0,0 +1,11 @@
+exports.up = function (knex) {
+  return knex.schema.createTable('bill_located_cost_entries', (table) => {
+    table.increments();
+
+    table.decimal('cost', 13, 3).unsigned();
+    table.integer('entry_id').unsigned();
+    table.integer('bill_located_cost_id').unsigned();
+  });
+};
+
+exports.down = function (knex) {};
--- a/server/src/database/migrations/20200722173423_create_items_entries_table.js
+++ b/server/src/database/migrations/20200722173423_create_items_entries_table.js
@@ -15,6 +15,8 @@ exports.up = function(knex) {
    table.integer('sell_account_id').unsigned().references('id').inTable('accounts');
    table.integer('cost_account_id').unsigned().references('id').inTable('accounts');

+    table.boolean('landed_cost').defaultTo(false);
+    table.decimal('allocated_cost_amount', 13, 3);
    table.timestamps();
  });
 };
--- a/server/src/interfaces/Bill.ts
+++ b/server/src/interfaces/Bill.ts
@@ -1,64 +1,69 @@
-import { IDynamicListFilterDTO } from "./DynamicFilter";
-import { IItemEntry, IItemEntryDTO } from "./ItemEntry";
+import { IDynamicListFilterDTO } from './DynamicFilter';
+import { IItemEntry, IItemEntryDTO } from './ItemEntry';

 export interface IBillDTO {
-  vendorId: number,
-  billNumber: string,
-  billDate: Date,
-  dueDate: Date,
-  referenceNo: string,
-  status: string,
-  note: string,
-  amount: number,
-  paymentAmount: number,
-  open: boolean,
-  entries: IItemEntryDTO[],
-};
+  vendorId: number;
+  billNumber: string;
+  billDate: Date;
+  dueDate: Date;
+  referenceNo: string;
+  status: string;
+  note: string;
+  amount: number;
+  paymentAmount: number;
+  open: boolean;
+  entries: IItemEntryDTO[];
+}

 export interface IBillEditDTO {
-  vendorId: number,
-  billNumber: string,
-  billDate: Date,
-  dueDate: Date,
-  referenceNo: string,
-  status: string,
-  note: string,
-  amount: number,
-  paymentAmount: number,
-  open: boolean,
-  entries: IItemEntryDTO[],
-};
+  vendorId: number;
+  billNumber: string;
+  billDate: Date;
+  dueDate: Date;
+  referenceNo: string;
+  status: string;
+  note: string;
+  amount: number;
+  paymentAmount: number;
+  open: boolean;
+  entries: IItemEntryDTO[];
+}

 export interface IBill {
-  id?: number,
+  id?: number;

-  vendorId: number,
-  billNumber: string,
-  billDate: Date,
-  dueDate: Date,
-  referenceNo: string,
-  status: string,
-  note: string,
-  amount: number,
-  paymentAmount: number,
-  currencyCode: string,
+  vendorId: number;
+  billNumber: string;
+  billDate: Date;
+  dueDate: Date;
+  referenceNo: string;
+  status: string;
+  note: string;

-  dueAmount: number,
-  overdueDays: number,
+  amount: number;
+  allocatedCostAmount: number;
+  landedCostAmount: number;
+  unallocatedCostAmount: number;

-  openedAt: Date | string,
+  paymentAmount: number;
+  currencyCode: string;

-  entries: IItemEntry[],
-  userId: number,
+  dueAmount: number;
+  overdueDays: number;

-  createdAt: Date,
-  updateAt: Date,
-};
+  openedAt: Date | string;

-export interface IBillsFilter extends IDynamicListFilterDTO { 
-  stringifiedFilterRoles?: string,
+  entries: IItemEntry[];
+  userId: number;
+
+  createdAt: Date;
+  updateAt: Date;
+}
+
+export interface IBillsFilter extends IDynamicListFilterDTO {
+  stringifiedFilterRoles?: string;
 }

 export interface IBillsService {
  validateVendorHasNoBills(tenantId: number, vendorId: number): Promise<void>;
-}
+}
--- a/server/src/interfaces/Expenses.ts
+++ b/server/src/interfaces/Expenses.ts
@@ -27,15 +27,20 @@ export interface IExpense {
  userId: number;
  paymentDate: Date;
  payeeId: number;
+  landedCostAmount: number;
+  allocatedCostAmount: number;
+  unallocatedCostAmount: number;
  categories: IExpenseCategory[];
 }

 export interface IExpenseCategory {
+  id?: number;
  expenseAccountId: number;
  index: number;
  description: string;
  expenseId: number;
  amount: number;
+  landedCost: boolean;
 }

 export interface IExpenseDTO {
@@ -56,6 +61,7 @@ export interface IExpenseCategoryDTO {
  index: number;
  description?: string;
  expenseId: number;
+  landedCost?: boolean;
 }

 export interface IExpensesService {
--- a/server/src/interfaces/ItemEntry.ts
+++ b/server/src/interfaces/ItemEntry.ts
@@ -17,8 +17,10 @@ export interface IItemEntry {

  sellAccountId: number,
  costAccountId: number,
+
+  landedCost?: boolean,
 }

 export interface IItemEntryDTO {
-  
+  landedCost?: boolean
 }
--- a/server/src/interfaces/LandedCost.ts
+++ b/server/src/interfaces/LandedCost.ts
@@ -0,0 +1,85 @@
+export interface IBillLandedCost {
+  fromTransactionId: number;
+  fromTransactionType: string;
+  amount: number;
+  BillId: number;
+}
+
+export interface IBillLandedCostEntry {
+  id?: number,
+  cost: number,
+  entryId: number,
+  billLocatedCostId: number,
+}
+
+export interface ILandedCostItemDTO {
+  entryId: number,
+  cost: number;
+}
+export  type ILandedCostType = 'Expense' | 'Bill';
+
+export interface ILandedCostDTO {
+  transactionType: ILandedCostType;
+  transactionId: number;
+  transactionEntryId: number,
+  allocationMethod: string;
+  description: string;
+  items: ILandedCostItemDTO[];
+}
+
+export interface ILandedCostQueryDTO {
+  vendorId: number;
+  fromDate: Date;
+  toDate: Date;
+}
+
+export interface IUnallocatedListCost {
+  costNumber: string;
+  costAmount: number;
+  unallocatedAmount: number;
+}
+
+export interface ILandedCostTransactionsQueryDTO {
+  transactionType: string,
+  date: Date,
+}
+
+export interface ILandedCostEntriesQueryDTO {
+  transactionType: string,
+  transactionId: number,
+}
+
+export interface ILandedCostTransaction {
+  id: number;
+  name: string;
+  amount: number;
+  allocatedCostAmount: number;
+  unallocatedCostAmount: number;
+  transactionType: string;
+  entries?: ILandedCostTransactionEntry[];
+}
+
+export interface ILandedCostTransactionEntry {
+  id: number;
+  name: string;
+  code: string;
+  amount: number;
+  description: string;
+}
+
+interface ILandedCostEntry {
+  id: number;
+  landedCost?: boolean;
+}
+
+export interface IBillLandedCostTransaction { 
+  id: number,
+  fromTranscationId: number,
+  fromTransactionType: string;
+  fromTransactionEntryId: number;
+
+  billId: number,
+  allocationMethod: string;
+  costAccountId: number,
+  description: string;
+};
--- a/server/src/interfaces/index.ts
+++ b/server/src/interfaces/index.ts
@@ -53,6 +53,7 @@ export * from './Table';
 export * from './Ledger';
 export * from './CashFlow';
 export * from './InventoryDetails';
+export * from './LandedCost';

 export interface I18nService {
  __: (input: string) => string;
--- a/server/src/loaders/tenantModels.ts
+++ b/server/src/loaders/tenantModels.ts
@@ -36,6 +36,8 @@ import Media from 'models/Media';
 import MediaLink from 'models/MediaLink';
 import InventoryAdjustment from 'models/InventoryAdjustment';
 import InventoryAdjustmentEntry from 'models/InventoryAdjustmentEntry';
+import BillLandedCost from 'models/BillLandedCost';
+import BillLandedCostEntry from 'models/BillLandedCostEntry';

 export default (knex) => {
  const models = {
@@ -75,6 +77,8 @@ export default (knex) => {
    Contact,
    InventoryAdjustment,
    InventoryAdjustmentEntry,
+    BillLandedCost,
+    BillLandedCostEntry
  };
  return mapValues(models, (model) => model.bindKnex(knex));
 }
--- a/server/src/models/Bill.js
+++ b/server/src/models/Bill.js
@@ -103,6 +103,7 @@ export default class Bill extends TenantModel {
      'remainingDays',
      'overdueDays',
      'isOverdue',
+      'unallocatedCostAmount'
    ];
  }

@@ -178,6 +179,14 @@ export default class Bill extends TenantModel {
    return this.overdueDays > 0;
  }

+  /**
+   * Retrieve the unallocated cost amount.
+   * @return {number}
+   */
+  get unallocatedCostAmount() {
+    return Math.max(this.landedCostAmount - this.allocatedCostAmount, 0);
+  }
+
  getOverdueDays(asDate = moment().format('YYYY-MM-DD')) {
    // Can't continue in case due date not defined.
    if (!this.dueDate) {
@@ -195,6 +204,7 @@ export default class Bill extends TenantModel {
  static get relationMappings() {
    const Contact = require('models/Contact');
    const ItemEntry = require('models/ItemEntry');
+    const BillLandedCost = require('models/BillLandedCost');

    return {
      vendor: {
@@ -220,6 +230,15 @@ export default class Bill extends TenantModel {
          builder.where('reference_type', 'Bill');
        },
      },
+
+      locatedLandedCosts: {
+        relation: Model.HasManyRelation,
+        modelClass: BillLandedCost.default,
+        join: {
+          from: 'bills.id',
+          to: 'bill_located_costs.billId',
+        },
+      },
    };
  }

--- a/server/src/models/BillLandedCost.js
+++ b/server/src/models/BillLandedCost.js
@@ -0,0 +1,36 @@
+import { Model } from 'objection';
+import TenantModel from 'models/TenantModel';
+
+export default class BillLandedCost extends TenantModel {
+  /**
+   * Table name
+   */
+  static get tableName() {
+    return 'bill_located_costs';
+  }
+
+  /**
+   * Model timestamps.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+   static get relationMappings() {
+    const BillLandedCostEntry = require('models/BillLandedCostEntry');
+
+    return {
+      allocateEntries: {
+        relation: Model.HasManyRelation,
+        modelClass: BillLandedCostEntry.default,
+        join: {
+          from: 'bill_located_costs.id',
+          to: 'bill_located_cost_entries.billLocatedCostId',
+        },
+      },
+    };
+  }
+}
--- a/server/src/models/BillLandedCostEntry.js
+++ b/server/src/models/BillLandedCostEntry.js
@@ -0,0 +1,10 @@
+import TenantModel from 'models/TenantModel';
+
+export default class BillLandedCostEntry extends TenantModel {
+  /**
+   * Table name
+   */
+  static get tableName() {
+    return 'bill_located_cost_entries';
+  }
+}
--- a/server/src/models/Expense.js
+++ b/server/src/models/Expense.js
@@ -1,27 +1,27 @@
-import { Model } from "objection";
-import TenantModel from "models/TenantModel";
-import { viewRolesBuilder } from "lib/ViewRolesBuilder";
+import { Model } from 'objection';
+import TenantModel from 'models/TenantModel';
+import { viewRolesBuilder } from 'lib/ViewRolesBuilder';

 export default class Expense extends TenantModel {
  /**
   * Table name
   */
  static get tableName() {
-    return "expenses_transactions";
+    return 'expenses_transactions';
  }

  /**
   * Account transaction reference type.
   */
  static get referenceType() {
-    return "Expense";
+    return 'Expense';
  }

  /**
   * Model timestamps.
   */
  get timestamps() {
-    return ["createdAt", "updatedAt"];
+    return ['createdAt', 'updatedAt'];
  }

  /**
@@ -37,14 +37,19 @@ export default class Expense extends TenantModel {
  static get media() {
    return true;
  }
-  
+
  static get virtualAttributes() {
-    return ["isPublished"];
+    return ['isPublished', 'unallocatedLandedCost'];
  }
+
  isPublished() {
    return Boolean(this.publishedAt);
  }

+  unallocatedLandedCost() {
+    return Math.max(this.amount - this.allocatedCostAmount, 0);
+  }
+
  /**
   * Model modifiers.
   */
@@ -52,28 +57,28 @@ export default class Expense extends TenantModel {
    return {
      filterByDateRange(query, startDate, endDate) {
        if (startDate) {
-          query.where("date", ">=", startDate);
+          query.where('date', '>=', startDate);
        }
        if (endDate) {
-          query.where("date", "<=", endDate);
+          query.where('date', '<=', endDate);
        }
      },
      filterByAmountRange(query, from, to) {
        if (from) {
-          query.where("amount", ">=", from);
+          query.where('amount', '>=', from);
        }
        if (to) {
-          query.where("amount", "<=", to);
+          query.where('amount', '<=', to);
        }
      },
      filterByExpenseAccount(query, accountId) {
        if (accountId) {
-          query.where("expense_account_id", accountId);
+          query.where('expense_account_id', accountId);
        }
      },
      filterByPaymentAccount(query, accountId) {
        if (accountId) {
-          query.where("payment_account_id", accountId);
+          query.where('payment_account_id', accountId);
        }
      },
      viewRolesBuilder(query, conditionals, expression) {
@@ -94,40 +99,40 @@ export default class Expense extends TenantModel {
   * Relationship mapping.
   */
  static get relationMappings() {
-    const Account = require("models/Account");
-    const ExpenseCategory = require("models/ExpenseCategory");
-    const Media = require("models/Media");
+    const Account = require('models/Account');
+    const ExpenseCategory = require('models/ExpenseCategory');
+    const Media = require('models/Media');

    return {
      paymentAccount: {
        relation: Model.BelongsToOneRelation,
        modelClass: Account.default,
        join: {
-          from: "expenses_transactions.paymentAccountId",
-          to: "accounts.id",
+          from: 'expenses_transactions.paymentAccountId',
+          to: 'accounts.id',
        },
      },
      categories: {
        relation: Model.HasManyRelation,
        modelClass: ExpenseCategory.default,
        join: {
-          from: "expenses_transactions.id",
-          to: "expense_transaction_categories.expenseId",
+          from: 'expenses_transactions.id',
+          to: 'expense_transaction_categories.expenseId',
        },
      },
      media: {
        relation: Model.ManyToManyRelation,
        modelClass: Media.default,
        join: {
-          from: "expenses_transactions.id",
+          from: 'expenses_transactions.id',
          through: {
-            from: "media_links.model_id",
-            to: "media_links.media_id",
+            from: 'media_links.model_id',
+            to: 'media_links.media_id',
          },
-          to: "media.id",
+          to: 'media.id',
        },
        filter(query) {
-          query.where("model_name", "Expense");
+          query.where('model_name', 'Expense');
        },
      },
    };
@@ -139,39 +144,39 @@ export default class Expense extends TenantModel {
  static get fields() {
    return {
      payment_date: {
-        label: "Payment date",
-        column: "payment_date",
-        columnType: "date",
+        label: 'Payment date',
+        column: 'payment_date',
+        columnType: 'date',
      },
      payment_account: {
-        label: "Payment account",
-        column: "payment_account_id",
-        relation: "accounts.id",
-        optionsResource: "account",
+        label: 'Payment account',
+        column: 'payment_account_id',
+        relation: 'accounts.id',
+        optionsResource: 'account',
      },
      amount: {
-        label: "Amount",
-        column: "total_amount",
-        columnType: "number",
+        label: 'Amount',
+        column: 'total_amount',
+        columnType: 'number',
      },
      currency_code: {
-        label: "Currency",
-        column: "currency_code",
-        optionsResource: "currency",
+        label: 'Currency',
+        column: 'currency_code',
+        optionsResource: 'currency',
      },
      reference_no: {
-        label: "Reference No.",
-        column: "reference_no",
-        columnType: "string",
+        label: 'Reference No.',
+        column: 'reference_no',
+        columnType: 'string',
      },
      description: {
-        label: "Description",
-        column: "description",
-        columnType: "string",
+        label: 'Description',
+        column: 'description',
+        columnType: 'string',
      },
      published: {
-        label: "Published",
-        column: "published_at",
+        label: 'Published',
+        column: 'published_at',
      },
      status: {
        label: 'Status',
@@ -194,9 +199,9 @@ export default class Expense extends TenantModel {
        },
      },
      created_at: {
-        label: "Created at",
-        column: "created_at",
-        columnType: "date",
+        label: 'Created at',
+        column: 'created_at',
+        columnType: 'date',
      },
    };
  }
--- a/server/src/models/ExpenseCategory.js
+++ b/server/src/models/ExpenseCategory.js
@@ -9,6 +9,21 @@ export default class ExpenseCategory extends TenantModel {
    return 'expense_transaction_categories';
  }

+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return ['unallocatedLandedCost'];
+  }
+
+  /**
+   * Remain unallocated landed cost.
+   * @return {number}
+   */
+  get unallocatedLandedCost() {
+    return Math.max(this.amount - this.allocatedCostAmount, 0);
+  }
+
  /**
   * Relationship mapping.
   */
--- a/server/src/services/Expenses/ExpensesService.ts
+++ b/server/src/services/Expenses/ExpensesService.ts
@@ -17,11 +17,12 @@ import {
  IExpensesService,
  ISystemUser,
  IPaginationMeta,
+  IExpenseCategory,
 } from 'interfaces';
 import DynamicListingService from 'services/DynamicListing/DynamicListService';
 import events from 'subscribers/events';
 import ContactsService from 'services/Contacts/ContactsService';
-import { ACCOUNT_PARENT_TYPE, ACCOUNT_ROOT_TYPE } from 'data/AccountTypes'
+import { ACCOUNT_PARENT_TYPE, ACCOUNT_ROOT_TYPE } from 'data/AccountTypes';

 const ERRORS = {
  EXPENSE_NOT_FOUND: 'expense_not_found',
@@ -32,6 +33,7 @@ const ERRORS = {
  PAYMENT_ACCOUNT_HAS_INVALID_TYPE: 'payment_account_has_invalid_type',
  EXPENSES_ACCOUNT_HAS_INVALID_TYPE: 'expenses_account_has_invalid_type',
  EXPENSE_ALREADY_PUBLISHED: 'expense_already_published',
+  EXPENSE_HAS_ASSOCIATED_LANDED_COST: 'EXPENSE_HAS_ASSOCIATED_LANDED_COST',
 };

@Service()
@@ -308,6 +310,27 @@ export default class ExpensesService implements IExpensesService {
    }
  }

+  /**
+   * Retrieve the expense landed cost amount.
+   * @param {IExpenseDTO} expenseDTO
+   * @return {number}
+   */
+  private getExpenseLandedCostAmount(expenseDTO: IExpenseDTO): number {
+    const landedCostEntries = expenseDTO.categories.filter((entry) => {
+      return entry.landedCost === true;
+    });
+    return this.getExpenseCategoriesTotal(landedCostEntries);
+  }
+
+  /**
+   * Retrieve the given expense categories total.
+   * @param {IExpenseCategory} categories
+   * @returns {number}
+   */
+  private getExpenseCategoriesTotal(categories): number {
+    return sumBy(categories, 'amount');
+  }
+
  /**
   * Mapping expense DTO to model.
   * @param  {IExpenseDTO} expenseDTO
@@ -315,12 +338,14 @@ export default class ExpensesService implements IExpensesService {
   * @return {IExpense}
   */
  private expenseDTOToModel(expenseDTO: IExpenseDTO, user?: ISystemUser) {
-    const totalAmount = sumBy(expenseDTO.categories, 'amount');
+    const landedCostAmount = this.getExpenseLandedCostAmount(expenseDTO);
+    const totalAmount = this.getExpenseCategoriesTotal(expenseDTO.categories);

    return {
      categories: [],
      ...omit(expenseDTO, ['publish']),
      totalAmount,
+      landedCostAmount,
      paymentDate: moment(expenseDTO.paymentDate).toMySqlDateTime(),
      ...(user
        ? {
@@ -340,7 +365,7 @@ export default class ExpensesService implements IExpensesService {
   * @param  {IExpenseDTO} expenseDTO
   * @return {number[]}
   */
-  mapExpensesAccountsIdsFromDTO(expenseDTO: IExpenseDTO) {
+  private mapExpensesAccountsIdsFromDTO(expenseDTO: IExpenseDTO) {
    return expenseDTO.categories.map((category) => category.expenseAccountId);
  }

@@ -544,15 +569,16 @@ export default class ExpensesService implements IExpensesService {
    authorizedUser: ISystemUser
  ): Promise<void> {
    const oldExpense = await this.getExpenseOrThrowError(tenantId, expenseId);
-    const {
-      expenseRepository,
-      expenseEntryRepository,
-    } = this.tenancy.repositories(tenantId);
+    const { expenseRepository, expenseEntryRepository } =
+      this.tenancy.repositories(tenantId);

    this.logger.info('[expense] trying to delete the expense.', {
      tenantId,
      expenseId,
    });
+    // Validates the expense has no associated landed cost.
+    await this.validateNoAssociatedLandedCost(tenantId, expenseId);
+
    await expenseEntryRepository.deleteBy({ expenseId });
    await expenseRepository.deleteById(expenseId);

@@ -572,7 +598,7 @@ export default class ExpensesService implements IExpensesService {

  /**
   * Filters the not published expenses.
-   * @param {IExpense[]} expenses - 
+   * @param {IExpense[]} expenses -
   */
  public getNonePublishedExpenses(expenses: IExpense[]): IExpense[] {
    return expenses.filter((expense) => !expense.publishedAt);
@@ -648,4 +674,25 @@ export default class ExpensesService implements IExpensesService {
    }
    return expense;
  }
+
+  /**
+   * Validates the expense has not associated landed cost
+   * references to the given expense.
+   * @param {number} tenantId
+   * @param {number} expenseId
+   */
+  public async validateNoAssociatedLandedCost(
+    tenantId: number,
+    expenseId: number
+  ) {
+    const { BillLandedCost } = this.tenancy.models(tenantId);
+
+    const associatedLandedCosts = await BillLandedCost.query()
+      .where('fromTransactionType', 'Expense')
+      .where('fromTransactionId', expenseId);
+
+    if (associatedLandedCosts.length > 0) {
+      throw new ServiceError(ERRORS.EXPENSE_HAS_ASSOCIATED_LANDED_COST);
+    }
+  }
 }
--- a/server/src/services/Purchases/Bills.ts
+++ b/server/src/services/Purchases/Bills.ts
@@ -40,7 +40,8 @@ import { ERRORS } from './constants';
@Service('Bills')
 export default class BillsService
  extends SalesInvoicesCost
-  implements IBillsService {
+  implements IBillsService
+{
  @Inject()
  inventoryService: InventoryService;

@@ -100,7 +101,7 @@ export default class BillsService
   * @param {number} tenantId -
   * @param {number} billId -
   */
-  private async getBillOrThrowError(tenantId: number, billId: number) {
+  public async getBillOrThrowError(tenantId: number, billId: number) {
    const { Bill } = this.tenancy.models(tenantId);

    this.logger.info('[bill] trying to get bill.', { tenantId, billId });
@@ -194,6 +195,28 @@ export default class BillsService
    };
  }

+  /**
+   * Retrieve the bill entries total.
+   * @param {IItemEntry[]} entries
+   * @returns {number}
+   */
+  private getBillEntriesTotal(tenantId: number, entries: IItemEntry[]): number {
+    const { ItemEntry } = this.tenancy.models(tenantId);
+
+    return sumBy(entries, (e) => ItemEntry.calcAmount(e));
+  }
+
+  /**
+   * Retrieve the bill landed cost amount.
+   * @param {IBillDTO} billDTO
+   * @returns {number}
+   */
+  private getBillLandedCostAmount(tenantId: number, billDTO: IBillDTO): number {
+    const costEntries = billDTO.entries.filter((entry) => entry.landedCost);
+
+    return this.getBillEntriesTotal(tenantId, costEntries);
+  }
+
  /**
   * Converts create bill DTO to model.
   * @param {number} tenantId
@@ -211,6 +234,9 @@ export default class BillsService

    const amount = sumBy(billDTO.entries, (e) => ItemEntry.calcAmount(e));

+    // Retrieve the landed cost amount from landed cost entries.
+    const landedCostAmount = this.getBillLandedCostAmount(tenantId, billDTO);
+
    // Bill number from DTO or from auto-increment.
    const billNumber = billDTO.billNumber || oldBill?.billNumber;

@@ -234,6 +260,7 @@ export default class BillsService
        'dueDate',
      ]),
      amount,
+      landedCostAmount,
      currencyCode: vendor.currencyCode,
      billNumber,
      entries,
@@ -498,7 +525,7 @@ export default class BillsService
    const bill = await Bill.query()
      .findById(billId)
      .withGraphFetched('vendor')
-      .withGraphFetched('entries');
+      .withGraphFetched('entries.item');

    if (!bill) {
      throw new ServiceError(ERRORS.BILL_NOT_FOUND);
@@ -538,10 +565,11 @@ export default class BillsService
    override?: boolean
  ): Promise<void> {
    // Loads the inventory items entries of the given sale invoice.
-    const inventoryEntries = await this.itemsEntriesService.filterInventoryEntries(
-      tenantId,
-      bill.entries
-    );
+    const inventoryEntries =
+      await this.itemsEntriesService.filterInventoryEntries(
+        tenantId,
+        bill.entries
+      );
    const transaction = {
      transactionId: bill.id,
      transactionType: 'Bill',
--- a/server/src/services/Purchases/LandedCost/BillLandedCost.ts
+++ b/server/src/services/Purchases/LandedCost/BillLandedCost.ts
@@ -0,0 +1,55 @@
+import { Service } from 'typedi';
+import { isEmpty } from 'lodash';
+import {
+  IBill,
+  IItem,
+  ILandedCostTransactionEntry,
+  ILandedCostTransaction,
+  IItemEntry,
+} from 'interfaces';
+
+@Service()
+export default class BillLandedCost {
+  /**
+   * Retrieve the landed cost transaction from the given bill transaction.
+   * @param {IBill} bill
+   * @returns {ILandedCostTransaction}
+   */
+  public transformToLandedCost = (bill: IBill): ILandedCostTransaction => {
+    const number = bill.billNumber || bill.referenceNo;
+    const name = [
+      number,
+      bill.currencyCode + ' ' + bill.unallocatedCostAmount,
+    ].join(' - ');
+
+    return {
+      id: bill.id,
+      name,
+      allocatedCostAmount: bill.allocatedCostAmount,
+      amount: bill.landedCostAmount,
+      unallocatedCostAmount: bill.unallocatedCostAmount,
+      transactionType: 'Bill',
+
+      ...(!isEmpty(bill.entries)) && {
+        entries: bill.entries.map(this.transformToLandedCostEntry),
+      },
+    };
+  };
+
+  /**
+   * Transformes bill entry to landed cost entry.
+   * @param {IItemEntry} billEntry - Bill entry.
+   * @return {ILandedCostTransactionEntry}
+   */
+  public transformToLandedCostEntry(
+    billEntry: IItemEntry & { item: IItem }
+  ): ILandedCostTransactionEntry {
+    return {
+      id: billEntry.id,
+      name: billEntry.item.name,
+      code: billEntry.item.code,
+      amount: billEntry.amount,
+      description: billEntry.description,
+    };
+  }
+}
--- a/server/src/services/Purchases/LandedCost/ExpenseLandedCost.ts
+++ b/server/src/services/Purchases/LandedCost/ExpenseLandedCost.ts
@@ -0,0 +1,53 @@
+import { Service } from 'typedi';
+import { isEmpty } from 'lodash';
+import {
+  IExpense,
+  ILandedCostTransactionEntry,
+  IExpenseCategory,
+  IAccount,
+  ILandedCostTransaction,
+} from 'interfaces';
+
+@Service()
+export default class ExpenseLandedCost {
+  /**
+   * Retrieve the landed cost transaction from the given expense transaction.
+   * @param {IExpense} expense
+   * @returns {ILandedCostTransaction}
+   */
+  public transformToLandedCost = (
+    expense: IExpense
+  ): ILandedCostTransaction => {
+    const name = [expense.currencyCode + ' ' + expense.totalAmount].join(' - ');
+
+    return {
+      id: expense.id,
+      name,
+      allocatedCostAmount: expense.allocatedCostAmount,
+      amount: expense.landedCostAmount,
+      unallocatedCostAmount: expense.unallocatedCostAmount,
+      transactionType: 'Expense',
+
+      ...(!isEmpty(expense.categories) && {
+        entries: expense.categories.map(this.transformToLandedCostEntry),
+      }),
+    };
+  };
+
+  /**
+   * Transformes expense entry to landed cost entry.
+   * @param {IExpenseCategory & { expenseAccount: IAccount }} expenseEntry -
+   * @return {ILandedCostTransactionEntry}
+   */
+  public transformToLandedCostEntry = (
+    expenseEntry: IExpenseCategory & { expenseAccount: IAccount }
+  ): ILandedCostTransactionEntry => {
+    return {
+      id: expenseEntry.id,
+      name: expenseEntry.expenseAccount.name,
+      code: expenseEntry.expenseAccount.code,
+      amount: expenseEntry.amount,
+      description: expenseEntry.description,
+    };
+  };
+}
--- a/server/src/services/Purchases/LandedCost/LandedCostListing.ts
+++ b/server/src/services/Purchases/LandedCost/LandedCostListing.ts
@@ -0,0 +1,78 @@
+import { Inject, Service } from 'typedi';
+import { ref } from 'objection';
+import {
+  ILandedCostTransactionsQueryDTO,
+  ILandedCostTransaction,
+  IBillLandedCostTransaction,
+} from 'interfaces';
+import TransactionLandedCost from './TransctionLandedCost';
+import BillsService from '../Bills';
+import HasTenancyService from 'services/Tenancy/TenancyService';
+
+@Service()
+export default class LandedCostListing {
+  @Inject()
+  transactionLandedCost: TransactionLandedCost;
+
+  @Inject()
+  billsService: BillsService;
+
+  @Inject()
+  tenancy: HasTenancyService;
+
+  /**
+   * Retrieve the landed costs based on the given query.
+   * @param {number} tenantId
+   * @param {ILandedCostTransactionsQueryDTO} query
+   * @returns {Promise<ILandedCostTransaction[]>}
+   */
+  public getLandedCostTransactions = async (
+    tenantId: number,
+    query: ILandedCostTransactionsQueryDTO
+  ): Promise<ILandedCostTransaction[]> => {
+    const { transactionType } = query;
+    const Model = this.transactionLandedCost.getModel(
+      tenantId,
+      query.transactionType
+    );
+
+    // Retrieve the model entities.
+    const transactions = await Model.query().onBuild((q) => {
+      q.where('allocated_cost_amount', '<', ref('landed_cost_amount'));
+
+      if (query.transactionType === 'Bill') {
+        q.withGraphFetched('entries.item');
+      } else if (query.transactionType === 'Expense') {
+        q.withGraphFetched('categories.expenseAccount');
+      }
+    });
+    return transactions.map((transaction) => ({
+      ...this.transactionLandedCost.transformToLandedCost(
+        transactionType,
+        transaction
+      ),
+    }));
+  };
+
+  /**
+   * Retrieve the bill associated landed cost transactions.
+   * @param {number} tenantId - Tenant id.
+   * @param {number} billId - Bill id.
+   * @return {Promise<IBillLandedCostTransaction>}
+   */
+  public getBillLandedCostTransactions = async (
+    tenantId: number,
+    billId: number
+  ): Promise<IBillLandedCostTransaction> => {
+    const { BillLandedCost } = this.tenancy.models(tenantId);
+
+    // Retrieve the given bill id or throw not found service error.
+    const bill = await this.billsService.getBillOrThrowError(tenantId, billId);
+
+    const landedCostTransactions = await BillLandedCost.query()
+      .where('bill_id', billId)
+      .withGraphFetched('allocateEntries');
+
+    return landedCostTransactions;
+  };
+}
--- a/server/src/services/Purchases/LandedCost/TransctionLandedCost.ts
+++ b/server/src/services/Purchases/LandedCost/TransctionLandedCost.ts
@@ -0,0 +1,61 @@
+import { Inject, Service } from 'typedi';
+import * as R from 'ramda';
+import { IBill, IExpense, ILandedCostTransaction } from 'interfaces';
+import { ServiceError } from 'exceptions';
+import BillLandedCost from './BillLandedCost';
+import ExpenseLandedCost from './ExpenseLandedCost';
+import HasTenancyService from 'services/Tenancy/TenancyService';
+import { ERRORS } from './constants';
+
+@Service()
+export default class TransactionLandedCost {
+  @Inject()
+  billLandedCost: BillLandedCost;
+
+  @Inject()
+  expenseLandedCost: ExpenseLandedCost;
+
+  @Inject()
+  tenancy: HasTenancyService;
+
+  /**
+   * Retrieve the cost transaction code model.
+   * @param {number} tenantId - Tenant id.
+   * @param {string} transactionType - Transaction type.
+   * @returns
+   */
+  public getModel = (
+    tenantId: number,
+    transactionType: string
+  ): IBill | IExpense => {
+    const Models = this.tenancy.models(tenantId);
+    const Model = Models[transactionType];
+
+    if (!Model) {
+      throw new ServiceError(ERRORS.COST_TYPE_UNDEFINED);
+    }
+    return Model;
+  }
+
+  /**
+   * Mappes the given expense or bill transaction to landed cost transaction.
+   * @param {string} transactionType - Transaction type.
+   * @param {IBill|IExpense} transaction - Expense or bill transaction.
+   * @returns {ILandedCostTransaction}
+   */
+  public transformToLandedCost = (
+    transactionType: string,
+    transaction: IBill | IExpense
+  ): ILandedCostTransaction => {
+    return R.compose(
+      R.when(
+        R.always(transactionType === 'Bill'),
+        this.billLandedCost.transformToLandedCost,
+      ),
+      R.when(
+        R.always(transactionType === 'Expense'),
+        this.expenseLandedCost.transformToLandedCost,
+      ),
+    )(transaction);
+  }
+}
--- a/server/src/services/Purchases/LandedCost/constants.ts
+++ b/server/src/services/Purchases/LandedCost/constants.ts
@@ -0,0 +1,15 @@
+
+
+
+export const ERRORS = {
+  COST_TYPE_UNDEFINED: 'COST_TYPE_UNDEFINED',
+  LANDED_COST_ITEMS_IDS_NOT_FOUND: 'LANDED_COST_ITEMS_IDS_NOT_FOUND',
+  COST_TRANSACTION_HAS_NO_ENOUGH_TO_LOCATE:
+    'COST_TRANSACTION_HAS_NO_ENOUGH_TO_LOCATE',
+  BILL_LANDED_COST_NOT_FOUND: 'BILL_LANDED_COST_NOT_FOUND',
+  COST_ENTRY_ID_NOT_FOUND: 'COST_ENTRY_ID_NOT_FOUND',
+  LANDED_COST_TRANSACTION_NOT_FOUND: 'LANDED_COST_TRANSACTION_NOT_FOUND',
+  LANDED_COST_ENTRY_NOT_FOUND: 'LANDED_COST_ENTRY_NOT_FOUND',
+  COST_AMOUNT_BIGGER_THAN_UNALLOCATED_AMOUNT: 'COST_AMOUNT_BIGGER_THAN_UNALLOCATED_AMOUNT',
+  ALLOCATE_COST_SHOULD_NOT_BE_BILL: 'ALLOCATE_COST_SHOULD_NOT_BE_BILL'
+};
--- a/server/src/services/Purchases/LandedCost/index.ts
+++ b/server/src/services/Purchases/LandedCost/index.ts
@@ -0,0 +1,504 @@
+import { Inject, Service } from 'typedi';
+import { difference, sumBy } from 'lodash';
+import BillsService from '../Bills';
+import { ServiceError } from 'exceptions';
+import {
+  IItemEntry,
+  IBill,
+  IBillLandedCost,
+  ILandedCostItemDTO,
+  ILandedCostDTO,
+} from 'interfaces';
+import InventoryService from 'services/Inventory/Inventory';
+import HasTenancyService from 'services/Tenancy/TenancyService';
+import { ERRORS } from './constants';
+import { mergeObjectsBykey } from 'utils';
+import JournalPoster from 'services/Accounting/JournalPoster';
+import JournalEntry from 'services/Accounting/JournalEntry';
+import TransactionLandedCost from './TransctionLandedCost';
+
+const CONFIG = {
+  COST_TYPES: {
+    Expense: {
+      entries: 'categories',
+    },
+    Bill: {
+      entries: 'entries',
+    },
+  },
+};
+
+@Service()
+export default class AllocateLandedCostService {
+  @Inject()
+  public billsService: BillsService;
+
+  @Inject()
+  public inventoryService: InventoryService;
+
+  @Inject()
+  public tenancy: HasTenancyService;
+
+  @Inject('logger')
+  public logger: any;
+
+  @Inject()
+  public transactionLandedCost: TransactionLandedCost;
+
+  /**
+   * Validates allocate cost items association with the purchase invoice entries.
+   * @param {IItemEntry[]} purchaseInvoiceEntries
+   * @param {ILandedCostItemDTO[]} landedCostItems
+   */
+  private validateAllocateCostItems = (
+    purchaseInvoiceEntries: IItemEntry[],
+    landedCostItems: ILandedCostItemDTO[]
+  ): void => {
+    // Purchase invoice entries items ids.
+    const purchaseInvoiceItems = purchaseInvoiceEntries.map((e) => e.id);
+    const landedCostItemsIds = landedCostItems.map((item) => item.entryId);
+
+    // Not found items ids.
+    const notFoundItemsIds = difference(
+      purchaseInvoiceItems,
+      landedCostItemsIds
+    );
+    // Throw items ids not found service error.
+    if (notFoundItemsIds.length > 0) {
+      throw new ServiceError(ERRORS.LANDED_COST_ITEMS_IDS_NOT_FOUND);
+    }
+  };
+
+  /**
+   * Saves the bill landed cost model.
+   * @param {number} tenantId
+   * @param {ILandedCostDTO} landedCostDTO
+   * @param {number} purchaseInvoiceId
+   * @returns {Promise<void>}
+   */
+  private saveBillLandedCostModel = (
+    tenantId: number,
+    landedCostDTO: ILandedCostDTO,
+    purchaseInvoiceId: number
+  ): Promise<IBillLandedCost> => {
+    const { BillLandedCost } = this.tenancy.models(tenantId);
+    const amount = sumBy(landedCostDTO.items, 'cost');
+
+    // Inserts the bill landed cost to the storage.
+    return BillLandedCost.query().insertGraph({
+      billId: purchaseInvoiceId,
+      fromTransactionType: landedCostDTO.transactionType,
+      fromTransactionId: landedCostDTO.transactionId,
+      fromTransactionEntryId: landedCostDTO.transactionEntryId,
+      amount,
+      allocationMethod: landedCostDTO.allocationMethod,
+      description: landedCostDTO.description,
+      allocateEntries: landedCostDTO.items,
+    });
+  };
+
+  /**
+   * Allocate the landed cost amount to cost transactions.
+   * @param {number} tenantId -
+   * @param {string} transactionType
+   * @param {number} transactionId
+   */
+  private incrementLandedCostAmount = async (
+    tenantId: number,
+    transactionType: string,
+    transactionId: number,
+    transactionEntryId: number,
+    amount: number
+  ): Promise<void> => {
+    const Model = this.transactionLandedCost.getModel(
+      tenantId,
+      transactionType
+    );
+    const relation = CONFIG.COST_TYPES[transactionType].entries;
+
+    // Increment the landed cost transaction amount.
+    await Model.query()
+      .where('id', transactionId)
+      .increment('allocatedCostAmount', amount);
+
+    // Increment the landed cost entry.
+    await Model.relatedQuery(relation)
+      .for(transactionId)
+      .where('id', transactionEntryId)
+      .increment('allocatedCostAmount', amount);
+  };
+
+  /**
+   * Reverts the landed cost amount to cost transaction.
+   * @param {number} tenantId - Tenant id.
+   * @param {string} transactionType - Transaction type.
+   * @param {number} transactionId - Transaction id.
+   * @param {number} amount - Amount
+   */
+  private revertLandedCostAmount = (
+    tenantId: number,
+    transactionType: string,
+    transactionId: number,
+    amount: number
+  ) => {
+    const Model = this.transactionLandedCost.getModel(tenantId, transactionType);
+
+    // Decrement the allocate cost amount of cost transaction.
+    return Model.query()
+      .where('id', transactionId)
+      .decrement('allocatedCostAmount', amount);
+  };
+
+  /**
+   * Retrieve the cost transaction or throw not found error.
+   * @param {number} tenantId
+   * @param {transactionType} transactionType -
+   * @param {transactionId} transactionId -
+   */
+  public getLandedCostOrThrowError = async (
+    tenantId: number,
+    transactionType: string,
+    transactionId: number
+  ) => {
+    const Model = this.transactionLandedCost.getModel(
+      tenantId,
+      transactionType
+    );
+    const model = await Model.query().findById(transactionId);
+
+    if (!model) {
+      throw new ServiceError(ERRORS.LANDED_COST_TRANSACTION_NOT_FOUND);
+    }
+    return this.transactionLandedCost.transformToLandedCost(
+      transactionType,
+      model
+    );
+  };
+
+  /**
+   * Retrieve the landed cost entries.
+   * @param {number} tenantId
+   * @param {string} transactionType
+   * @param {number} transactionId
+   * @returns
+   */
+  public getLandedCostEntry = async (
+    tenantId: number,
+    transactionType: string,
+    transactionId: number,
+    transactionEntryId: number
+  ): Promise<any> => {
+    const Model = this.transactionLandedCost.getModel(
+      tenantId,
+      transactionType
+    );
+    const relation = CONFIG.COST_TYPES[transactionType].entries;
+
+    const entry = await Model.relatedQuery(relation)
+      .for(transactionId)
+      .findOne('id', transactionEntryId)
+      .where('landedCost', true);
+
+    if (!entry) {
+      throw new ServiceError(ERRORS.LANDED_COST_ENTRY_NOT_FOUND);
+    }
+    return entry;
+  };
+
+  /**
+   * Retrieve allocate items cost total.
+   * @param {ILandedCostDTO} landedCostDTO
+   * @returns {number}
+   */
+  private getAllocateItemsCostTotal = (
+    landedCostDTO: ILandedCostDTO
+  ): number => {
+    return sumBy(landedCostDTO.items, 'cost');
+  };
+
+  /**
+   * Validate allocate cost transaction should not be bill transaction.
+   * @param {number} purchaseInvoiceId
+   * @param {string} transactionType
+   * @param {number} transactionId
+   */
+  private validateAllocateCostNotSameBill = (
+    purchaseInvoiceId: number,
+    transactionType: string,
+    transactionId: number
+  ): void => {
+    if (transactionType === 'Bill' && transactionId === purchaseInvoiceId) {
+      throw new ServiceError(ERRORS.ALLOCATE_COST_SHOULD_NOT_BE_BILL);
+    }
+  };
+
+  /**
+   * Validates the landed cost entry amount.
+   * @param {number} unallocatedCost -
+   * @param {number} amount -
+   */
+  private validateLandedCostEntryAmount = (
+    unallocatedCost: number,
+    amount: number
+  ): void => {
+    console.log(unallocatedCost, amount, '123');
+
+    if (unallocatedCost < amount) {
+      throw new ServiceError(ERRORS.COST_AMOUNT_BIGGER_THAN_UNALLOCATED_AMOUNT);
+    }
+  };
+
+  /**
+   * Records inventory transactions.
+   * @param {number} tenantId
+   * @param {} allocateEntries
+   */
+  private recordInventoryTransactions = async (
+    tenantId: number,
+    allocateEntries,
+    purchaseInvoice: IBill,
+    landedCostId: number
+  ) => {
+    const costEntries = mergeObjectsBykey(
+      purchaseInvoice.entries,
+      allocateEntries.map((e) => ({ ...e, id: e.itemId })),
+      'id'
+    );
+    // Inventory transaction.
+    const inventoryTransactions = costEntries.map((entry) => ({
+      date: purchaseInvoice.billDate,
+      itemId: entry.itemId,
+      direction: 'IN',
+      quantity: 0,
+      rate: entry.cost,
+      transactionType: 'LandedCost',
+      transactionId: landedCostId,
+      entryId: entry.id,
+    }));
+
+    return this.inventoryService.recordInventoryTransactions(
+      tenantId,
+      inventoryTransactions
+    );
+  };
+
+  /**
+   * =================================
+   * Allocate landed cost.
+   * =================================
+   * - Validates the allocate cost not the same purchase invoice id.
+   * - Get the given bill (purchase invoice) or throw not found error.
+   * - Get the given landed cost transaction or throw not found error.
+   * - Validate landed cost transaction has enough unallocated cost amount.
+   * - Validate landed cost transaction entry has enough unallocated cost amount.
+   * - Validate allocate entries existance and associated with cost bill transaction.
+   * - Writes inventory landed cost transaction.
+   * - Increment the allocated landed cost transaction.
+   * - Increment the allocated landed cost transaction entry.
+   *
+   * @param {ILandedCostDTO} landedCostDTO - Landed cost DTO.
+   * @param {number} tenantId - Tenant id.
+   * @param {number} purchaseInvoiceId - Purchase invoice id.
+   */
+  public allocateLandedCost = async (
+    tenantId: number,
+    allocateCostDTO: ILandedCostDTO,
+    purchaseInvoiceId: number
+  ): Promise<{
+    billLandedCost: IBillLandedCost;
+  }> => {
+    // Retrieve total cost of allocated items.
+    const amount = this.getAllocateItemsCostTotal(allocateCostDTO);
+
+    // Retrieve the purchase invoice or throw not found error.
+    const purchaseInvoice = await this.billsService.getBillOrThrowError(
+      tenantId,
+      purchaseInvoiceId
+    );
+    // Retrieve landed cost transaction or throw not found service error.
+    const landedCostTransaction = await this.getLandedCostOrThrowError(
+      tenantId,
+      allocateCostDTO.transactionType,
+      allocateCostDTO.transactionId
+    );
+    // Retrieve landed cost transaction entries.
+    const landedCostEntry = await this.getLandedCostEntry(
+      tenantId,
+      allocateCostDTO.transactionType,
+      allocateCostDTO.transactionId,
+      allocateCostDTO.transactionEntryId
+    );
+    // Validates allocate cost items association with the purchase invoice entries.
+    this.validateAllocateCostItems(
+      purchaseInvoice.entries,
+      allocateCostDTO.items
+    );
+    // Validate the amount of cost with unallocated landed cost.
+    this.validateLandedCostEntryAmount(
+      landedCostEntry.unallocatedLandedCost,
+      amount
+    );
+    // Save the bill landed cost model.
+    const billLandedCost = await this.saveBillLandedCostModel(
+      tenantId,
+      allocateCostDTO,
+      purchaseInvoiceId
+    );
+    // Records the inventory transactions.
+    // await this.recordInventoryTransactions(
+    //   tenantId,
+    //   allocateCostDTO.items,
+    //   purchaseInvoice,
+    //   landedCostTransaction.id
+    // );
+    // Increment landed cost amount on transaction and entry.
+    await this.incrementLandedCostAmount(
+      tenantId,
+      allocateCostDTO.transactionType,
+      allocateCostDTO.transactionId,
+      allocateCostDTO.transactionEntryId,
+      amount
+    );
+    // Write the landed cost journal entries.
+    // await this.writeJournalEntry(tenantId, purchaseInvoice, billLandedCost);
+
+    return { billLandedCost };
+  };
+
+  /**
+   * Write journal entries of the given purchase invoice landed cost.
+   * @param tenantId
+   * @param purchaseInvoice
+   * @param landedCost
+   */
+  private writeJournalEntry = async (
+    tenantId: number,
+    purchaseInvoice: IBill,
+    landedCost: IBillLandedCost
+  ) => {
+    const journal = new JournalPoster(tenantId);
+    const billEntriesById = purchaseInvoice.entries;
+
+    const commonEntry = {
+      referenceType: 'Bill',
+      referenceId: purchaseInvoice.id,
+      date: purchaseInvoice.billDate,
+      indexGroup: 300,
+    };
+    const costEntry = new JournalEntry({
+      ...commonEntry,
+      credit: landedCost.amount,
+      account: landedCost.costAccountId,
+      index: 1,
+    });
+    journal.credit(costEntry);
+
+    landedCost.allocateEntries.forEach((entry, index) => {
+      const billEntry = billEntriesById[entry.entryId];
+
+      const inventoryEntry = new JournalEntry({
+        ...commonEntry,
+        debit: entry.cost,
+        account: billEntry.item.inventoryAccountId,
+        index: 1 + index,
+      });
+      journal.debit(inventoryEntry);
+    });
+    return journal;
+  };
+
+  /**
+   * Retrieve the give bill landed cost or throw not found service error.
+   * @param {number} tenantId - Tenant id.
+   * @param {number} landedCostId - Landed cost id.
+   * @returns {Promise<IBillLandedCost>}
+   */
+  public getBillLandedCostOrThrowError = async (
+    tenantId: number,
+    landedCostId: number
+  ): Promise<IBillLandedCost> => {
+    const { BillLandedCost } = this.tenancy.models(tenantId);
+
+    // Retrieve the bill landed cost model.
+    const billLandedCost = await BillLandedCost.query().findById(landedCostId);
+
+    if (!billLandedCost) {
+      throw new ServiceError(ERRORS.BILL_LANDED_COST_NOT_FOUND);
+    }
+    return billLandedCost;
+  };
+
+  /**
+   * Deletes the landed cost transaction with assocaited allocate entries.
+   * @param {number} tenantId
+   * @param {number} landedCostId
+   */
+  public deleteLandedCost = async (
+    tenantId: number,
+    landedCostId: number
+  ): Promise<void> => {
+    const { BillLandedCost, BillLandedCostEntry } =
+      this.tenancy.models(tenantId);
+
+    // Deletes the bill landed cost allocated entries associated to landed cost.
+    await BillLandedCostEntry.query()
+      .where('bill_located_cost_id', landedCostId)
+      .delete();
+
+    // Delete the bill landed cost from the storage.
+    await BillLandedCost.query().where('id', landedCostId).delete();
+  };
+
+  /**
+   * Deletes the allocated landed cost.
+   * ==================================
+   * - Delete bill landed cost transaction with associated allocate entries.
+   * - Delete the associated inventory transactions.
+   * - Decrement allocated amount of landed cost transaction and entry.
+   * - Revert journal entries.
+   *
+   * @param {number} tenantId - Tenant id.
+   * @param {number} landedCostId - Landed cost id.
+   * @return {Promise<void>}
+   */
+  public deleteAllocatedLandedCost = async (
+    tenantId: number,
+    landedCostId: number
+  ): Promise<{
+    landedCostId: number;
+  }> => {
+    // Retrieves the bill landed cost.
+    const oldBillLandedCost = await this.getBillLandedCostOrThrowError(
+      tenantId,
+      landedCostId
+    );
+    // Delete landed cost transaction with assocaited locate entries.
+    await this.deleteLandedCost(tenantId, landedCostId);
+
+    // Removes the inventory transactions.
+    await this.removeInventoryTransactions(tenantId, landedCostId);
+
+    // Reverts the landed cost amount to the cost transaction.
+    await this.revertLandedCostAmount(
+      tenantId,
+      oldBillLandedCost.fromTransactionType,
+      oldBillLandedCost.fromTransactionId,
+      oldBillLandedCost.amount
+    );
+    return { landedCostId };
+  };
+
+  /**
+   * Deletes the inventory transaction.
+   * @param {number} tenantId
+   * @param {number} landedCostId
+   * @returns
+   */
+  private removeInventoryTransactions = (tenantId, landedCostId: number) => {
+    return this.inventoryService.deleteInventoryTransactions(
+      tenantId,
+      landedCostId,
+      'LandedCost'
+    );
+  };
+}
--- a/server/src/subscribers/events.ts
+++ b/server/src/subscribers/events.ts
@@ -203,5 +203,15 @@ export default {
    onQuickCreated: 'onInventoryAdjustmentQuickCreated',
    onDeleted: 'onInventoryAdjustmentDeleted',
    onPublished: 'onInventoryAdjustmentPublished',
+  },
+
+  /**
+   * Bill landed cost.
+   */
+  billLandedCost: {
+    onCreate: 'onBillLandedCostCreate',
+    onCreated: 'onBillLandedCostCreated',
+    onDelete: 'onBillLandedCostDelete',
+    onDeleted: 'onBillLandedCostDeleted'
  }
 }
--- a/server/src/utils/index.ts
+++ b/server/src/utils/index.ts
@@ -373,6 +373,11 @@ const accumSum = (data, callback) => {
  }, 0)
 }

+const mergeObjectsBykey = (object1, object2, key) => {
+  var merged = _.merge(_.keyBy(object1, key), _.keyBy(object2, key));
+  return _.values(merged);
+}
+
 export {
  accumSum,
  increment,
@@ -400,5 +405,6 @@ export {
  transactionIncrement,
  transformToMapBy,
  dateRangeFromToCollection,
-  transformToMapKeyValue
+  transformToMapKeyValue,
+  mergeObjectsBykey
 };