feat: compute items cost of inventory adjustments transcations.

server/src/api/controllers/Inventory/InventoryAdjustments.ts

@@ -115,8 +115,8 @@ export default class InventoryAdjustmentsController extends BaseController {
         tenantId,
         adjustmentId
       );
-
       return res.status(200).send({
+        id: adjustmentId,
         message: 'The inventory adjustment has been deleted successfully.',
       });
     } catch (error) {

server/src/api/controllers/Items.ts

@@ -25,14 +25,14 @@ export default class ItemsController extends BaseController {
 
     router.post(
       '/',
-      [...this.validateItemSchema, ...this.validateNewItemSchema],
+      this.validateItemSchema,
       this.validationResult,
       asyncMiddleware(this.newItem.bind(this)),
       this.handlerServiceErrors
     );
     router.post(
       '/:id/activate',
-      [...this.validateSpecificItemSchema],
+      this.validateSpecificItemSchema,
       this.validationResult,
       asyncMiddleware(this.activateItem.bind(this)),
       this.handlerServiceErrors
@@ -83,30 +83,6 @@ export default class ItemsController extends BaseController {
     return router;
   }
 
-  /**
-   * New item validation schema.
-   */
-  get validateNewItemSchema(): ValidationChain[] {
-    return [
-      check('opening_quantity').default(0).isInt({ min: 0 }).toInt(),
-      check('opening_cost')
-        .if(body('opening_quantity').exists().isInt({ min: 1 }))
-        .exists()
-        .isFloat(),
-      check('opening_cost')
-        .optional({ nullable: true })
-        .isFloat({ min: 0 })
-        .toFloat(),
-      check('opening_date')
-        .if(
-          body('opening_quantity').exists().isFloat({ min: 1 }) ||
-          body('opening_cost').exists().isFloat({ min: 1 })
-        )
-        .exists(),
-      check('opening_date').optional({ nullable: true }).isISO8601().toDate(),
-    ];
-  }
-
   /**
    * Validate item schema.
    */
@@ -503,6 +479,11 @@ export default class ItemsController extends BaseController {
           errors: [{ type: 'ITEM_HAS_ASSOCIATED_TRANSACTINS', code: 320 }],
         });
       }
+      if (error.errorType === 'ITEM_HAS_ASSOCIATED_INVENTORY_ADJUSTMENT') {
+        return res.status(400).send({
+          errors: [{ type: 'ITEM_HAS_ASSOCIATED_INVENTORY_ADJUSTMENT', code: 330 }],
+        });
+      }
     }
     next(error);
   }

server/src/database/migrations/20190822214306_create_items_table.js

@@ -18,10 +18,6 @@ exports.up = function (knex) {
     table.text('purchase_description').nullable();
     table.integer('quantity_on_hand');
 
-    table.integer('opening_quantity');
-    table.decimal('opening_cost', 13, 3);
-    table.date('opening_date');
-
     table.text('note').nullable();
     table.boolean('active');
     table.integer('category_id').unsigned().index().references('id').inTable('items_categories');

server/src/database/migrations/20200722164251_create_inventory_transactions_table.js

@@ -10,7 +10,8 @@ exports.up = function(knex) {
     table.integer('quantity').unsigned();
     table.decimal('rate', 13, 3).unsigned();
 
-    table.string('lot_number').index();
+    table.integer('lot_number').index();
+    table.integer('cost_account_id').unsigned().index().references('id').inTable('accounts');
  
     table.string('transaction_type').index();
     table.integer('transaction_id').unsigned().index();

server/src/interfaces/InventoryAdjustment.ts

@@ -1,5 +1,5 @@
 
-type IAdjustmentTypes = 'increment' | 'decrement' | 'value_adjustment';
+type IAdjustmentTypes = 'increment' | 'decrement';
 
 export interface IQuickInventoryAdjustmentDTO {
   date: Date | string;
@@ -20,6 +20,7 @@ export interface IInventoryAdjustment {
   reason: string;
   description: string;
   referenceNo: string;
+  inventoryDirection?: 'IN' | 'OUT',
   entries: IInventoryAdjustmentEntry[];
   userId: number;
 };

server/src/interfaces/InventoryTransaction.ts

@@ -3,14 +3,14 @@ export type TInventoryTransactionDirection = 'IN' | 'OUT';
 
 export interface IInventoryTransaction {
   id?: number,
-  date: Date,
+  date: Date|string,
   direction: TInventoryTransactionDirection,
   itemId: number,
   quantity: number,
   rate: number,
   transactionType: string,
   transactionId: number,
-  lotNumber: string,
+  lotNumber: number,
   entryId: number,
   createdAt?: Date,
   updatedAt?: Date,
@@ -25,7 +25,7 @@ export interface IInventoryLotCost {
   rate: number,
   remaining: number,
   cost: number,
-  lotNumber: string|number,
+  lotNumber: number,
   transactionType: string,
   transactionId: number,
   entryId: number

server/src/interfaces/Item.ts

@@ -22,10 +22,6 @@ export interface IItem{
 
   quantityOnHand: number,
 
-  openingQuantity: number,
-  openingCost: number,
-  openingDate: Date,
-
   note: string,
   active: boolean,
 
@@ -58,10 +54,6 @@ export interface IItemDTO {
 
   quantityOnHand: number,
 
-  openingQuantity?: number,
-  openingCost?: number,
-  openingDate?: Date,
-
   note: string,
   active: boolean,
 

server/src/loaders/events.ts

@@ -23,10 +23,12 @@ import 'subscribers/SaleReceipt/SyncItemsQuantity';
 import 'subscribers/SaleReceipt/WriteInventoryTransactions';
 import 'subscribers/SaleReceipt/WriteJournalEntries';
 
+import 'subscribers/Inventory/Inventory';
+import 'subscribers/Inventory/InventoryAdjustment';
+
 import 'subscribers/customers';
 import 'subscribers/vendors';
 import 'subscribers/paymentMades';
 import 'subscribers/paymentReceives';
 import 'subscribers/saleEstimates';
-import 'subscribers/inventory';
 import 'subscribers/items';

server/src/loaders/tenantModels.ts

@@ -35,6 +35,8 @@ import ManualJournal from 'models/ManualJournal';
 import ManualJournalEntry from 'models/ManualJournalEntry';
 import Media from 'models/Media';
 import MediaLink from 'models/MediaLink';
+import InventoryAdjustment from 'models/InventoryAdjustment';
+import InventoryAdjustmentEntry from 'models/InventoryAdjustmentEntry';
 
 export default (knex) => {
   const models = {
@@ -73,6 +75,8 @@ export default (knex) => {
     Vendor,
     Customer,
     Contact,
+    InventoryAdjustment,
+    InventoryAdjustmentEntry,
   };
   return mapValues(models, (model) => model.bindKnex(knex));
 }

server/src/models/AccountTransaction.js

@@ -17,6 +17,34 @@ export default class AccountTransaction extends TenantModel {
     return ['createdAt'];
   }
 
+  static get virtualAttributes() {
+    return ['referenceTypeFormatted'];
+  }
+
+  /**
+   * Retrieve formatted reference type.
+   * @return {string}
+   */
+  get referenceTypeFormatted() {
+    return AccountTransaction.getReferenceTypeFormatted(this.referenceType);
+  }
+
+  /**
+   * Reference type formatted.
+   */
+  static getReferenceTypeFormatted(referenceType) {
+    const mapped = {
+      'SaleInvoice': 'Sale invoice',
+      'SaleReceipt': 'Sale receipt',
+      'PaymentReceive': 'Payment receive',
+      'BillPayment': 'Payment made',
+      'VendorOpeningBalance': 'Vendor opening balance',
+      'CustomerOpeningBalance': 'Customer opening balance',
+      'InventoryAdjustment': 'Inventory adjustment'
+    };
+    return mapped[referenceType] || '';
+  }
+
   /**
    * Model modifiers.
    */

server/src/models/InventoryAdjustment.js

@@ -16,6 +16,28 @@ export default class InventoryAdjustment extends TenantModel {
     return ['created_at'];
   }
 
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return ['inventoryDirection'];
+  }
+
+  /**
+   * Retrieve formatted reference type.
+   */
+  get inventoryDirection() {
+    return InventoryAdjustment.getInventoryDirection(this.type);
+  }
+
+  static getInventoryDirection(type) {
+    const directions = {
+      'increment': 'IN',
+      'decrement': 'OUT',
+    };
+    return directions[type] || '';
+  }
+
   /**
    * Relationship mapping.
    */

server/src/services/Accounting/JournalCommands.ts

@@ -231,7 +231,6 @@ export default class JournalCommands {
       referenceId: expense.id,
       date: expense.paymentDate,
       userId,
-      draft: !expense.publishedAt,
     };
     const paymentJournalEntry = new JournalEntry({
       credit: expense.totalAmount,
@@ -330,7 +329,6 @@ export default class JournalCommands {
         note: entry.note,
         date: manualJournalObj.date,
         userId: manualJournalObj.userId,
-        draft: !manualJournalObj.status,
         index: entry.index,
       });
       if (entry.debit) {
@@ -354,7 +352,7 @@ export default class JournalCommands {
     inventoryCostLot: IInventoryLotCost & { item: IItem }
   ) {
     const commonEntry = {
-      referenceType: 'SaleInvoice',
+      referenceType: inventoryCostLot.transactionType,
       referenceId: inventoryCostLot.transactionId,
       date: inventoryCostLot.date,
     };

server/src/services/Accounts/AccountsService.ts

@@ -164,7 +164,7 @@ export default class AccountsService {
    * @param {number} accountId
    * @return {IAccount}
    */
-  private async getAccountOrThrowError(tenantId: number, accountId: number) {
+  public async getAccountOrThrowError(tenantId: number, accountId: number) {
     const { accountRepository } = this.tenancy.repositories(tenantId);
 
     this.logger.info('[accounts] validating the account existance.', {

server/src/services/ExchangeRates/ExchangeRatesService.ts

@@ -30,25 +30,34 @@ export default class ExchangeRatesService implements IExchangeRatesService {
   eventDispatcher: EventDispatcherInterface;
 
   @Inject()
-  tenancy: TenancyService;  
+  tenancy: TenancyService;
 
   /**
    * Creates a new exchange rate.
-   * @param {number} tenantId 
-   * @param {IExchangeRateDTO} exchangeRateDTO 
+   * @param {number} tenantId
+   * @param {IExchangeRateDTO} exchangeRateDTO
    * @returns {Promise<IExchangeRate>}
    */
-  public async newExchangeRate(tenantId: number, exchangeRateDTO: IExchangeRateDTO): Promise<IExchangeRate> {
+  public async newExchangeRate(
+    tenantId: number,
+    exchangeRateDTO: IExchangeRateDTO
+  ): Promise<IExchangeRate> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    this.logger.info('[exchange_rates] trying to insert new exchange rate.', { tenantId, exchangeRateDTO });
+    this.logger.info('[exchange_rates] trying to insert new exchange rate.', {
+      tenantId,
+      exchangeRateDTO,
+    });
     await this.validateExchangeRatePeriodExistance(tenantId, exchangeRateDTO);
 
     const exchangeRate = await ExchangeRate.query().insertAndFetch({
       ...exchangeRateDTO,
       date: moment(exchangeRateDTO.date).format('YYYY-MM-DD'),
     });
-    this.logger.info('[exchange_rates] inserted successfully.', { tenantId, exchangeRateDTO });
+    this.logger.info('[exchange_rates] inserted successfully.', {
+      tenantId,
+      exchangeRateDTO,
+    });
     return exchangeRate;
   }
 
@@ -58,14 +67,28 @@ export default class ExchangeRatesService implements IExchangeRatesService {
    * @param {number} exchangeRateId - Exchange rate id.
    * @param {IExchangeRateEditDTO} editExRateDTO - Edit exchange rate DTO.
    */
-  public async editExchangeRate(tenantId: number, exchangeRateId: number, editExRateDTO: IExchangeRateEditDTO): Promise<void> {
+  public async editExchangeRate(
+    tenantId: number,
+    exchangeRateId: number,
+    editExRateDTO: IExchangeRateEditDTO
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    this.logger.info('[exchange_rates] trying to edit exchange rate.', { tenantId, exchangeRateId, editExRateDTO });
+    this.logger.info('[exchange_rates] trying to edit exchange rate.', {
+      tenantId,
+      exchangeRateId,
+      editExRateDTO,
+    });
     await this.validateExchangeRateExistance(tenantId, exchangeRateId);
 
-    await ExchangeRate.query().where('id', exchangeRateId).update({ ...editExRateDTO });
-    this.logger.info('[exchange_rates] exchange rate edited successfully.', { tenantId, exchangeRateId, editExRateDTO });
+    await ExchangeRate.query()
+      .where('id', exchangeRateId)
+      .update({ ...editExRateDTO });
+    this.logger.info('[exchange_rates] exchange rate edited successfully.', {
+      tenantId,
+      exchangeRateId,
+      editExRateDTO,
+    });
   }
 
   /**
@@ -73,7 +96,10 @@ export default class ExchangeRatesService implements IExchangeRatesService {
    * @param {number} tenantId - Tenant id.
    * @param {number} exchangeRateId - Exchange rate id.
    */
-  public async deleteExchangeRate(tenantId: number, exchangeRateId: number): Promise<void> {
+  public async deleteExchangeRate(
+    tenantId: number,
+    exchangeRateId: number
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
     await this.validateExchangeRateExistance(tenantId, exchangeRateId);
 
@@ -83,29 +109,43 @@ export default class ExchangeRatesService implements IExchangeRatesService {
   /**
    * Listing exchange rates details.
    * @param {number} tenantId - Tenant id.
-   * @param {IExchangeRateFilter} exchangeRateFilter - Exchange rates list filter. 
+   * @param {IExchangeRateFilter} exchangeRateFilter - Exchange rates list filter.
    */
-  public async listExchangeRates(tenantId: number, exchangeRateFilter: IExchangeRateFilter): Promise<void> {
+  public async listExchangeRates(
+    tenantId: number,
+    exchangeRateFilter: IExchangeRateFilter
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
-    const exchangeRates = await ExchangeRate.query()
-      .pagination(exchangeRateFilter.page - 1, exchangeRateFilter.pageSize);
-    
+    const exchangeRates = await ExchangeRate.query().pagination(
+      exchangeRateFilter.page - 1,
+      exchangeRateFilter.pageSize
+    );
+
     return exchangeRates;
   }
 
   /**
    * Deletes exchange rates in bulk.
-   * @param {number} tenantId 
-   * @param {number[]} exchangeRatesIds 
+   * @param {number} tenantId
+   * @param {number[]} exchangeRatesIds
    */
-  public async deleteBulkExchangeRates(tenantId: number, exchangeRatesIds: number[]): Promise<void> {
+  public async deleteBulkExchangeRates(
+    tenantId: number,
+    exchangeRatesIds: number[]
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    this.logger.info('[exchange_rates] trying delete in bulk.', { tenantId, exchangeRatesIds });
+    this.logger.info('[exchange_rates] trying delete in bulk.', {
+      tenantId,
+      exchangeRatesIds,
+    });
     await this.validateExchangeRatesIdsExistance(tenantId, exchangeRatesIds);
 
     await ExchangeRate.query().whereIn('id', exchangeRatesIds).delete();
-    this.logger.info('[exchange_rates] deleted successfully.', { tenantId, exchangeRatesIds });
+    this.logger.info('[exchange_rates] deleted successfully.', {
+      tenantId,
+      exchangeRatesIds,
+    });
   }
 
   /**
@@ -114,16 +154,23 @@ export default class ExchangeRatesService implements IExchangeRatesService {
    * @param {IExchangeRateDTO} exchangeRateDTO - Exchange rate DTO.
    * @return {Promise<void>}
    */
-  private async validateExchangeRatePeriodExistance(tenantId: number, exchangeRateDTO: IExchangeRateDTO): Promise<void> {
+  private async validateExchangeRatePeriodExistance(
+    tenantId: number,
+    exchangeRateDTO: IExchangeRateDTO
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    this.logger.info('[exchange_rates] trying to validate period existance.', { tenantId });
+    this.logger.info('[exchange_rates] trying to validate period existance.', {
+      tenantId,
+    });
     const foundExchangeRate = await ExchangeRate.query()
       .where('currency_code', exchangeRateDTO.currencyCode)
       .where('date', exchangeRateDTO.date);
 
     if (foundExchangeRate.length > 0) {
-      this.logger.info('[exchange_rates] given exchange rate period exists.', { tenantId });
+      this.logger.info('[exchange_rates] given exchange rate period exists.', {
+        tenantId,
+      });
       throw new ServiceError(ERRORS.EXCHANGE_RATE_PERIOD_EXISTS);
     }
   }
@@ -134,14 +181,25 @@ export default class ExchangeRatesService implements IExchangeRatesService {
    * @param {number} exchangeRateId - Exchange rate id.
    * @returns {Promise<void>}
    */
-  private async validateExchangeRateExistance(tenantId: number, exchangeRateId: number) {
+  private async validateExchangeRateExistance(
+    tenantId: number,
+    exchangeRateId: number
+  ) {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    this.logger.info('[exchange_rates] trying to validate exchange rate id existance.', { tenantId, exchangeRateId });
-    const foundExchangeRate = await ExchangeRate.query().findById(exchangeRateId);
+    this.logger.info(
+      '[exchange_rates] trying to validate exchange rate id existance.',
+      { tenantId, exchangeRateId }
+    );
+    const foundExchangeRate = await ExchangeRate.query().findById(
+      exchangeRateId
+    );
 
     if (!foundExchangeRate) {
-      this.logger.info('[exchange_rates] exchange rate not found.', { tenantId, exchangeRateId });
+      this.logger.info('[exchange_rates] exchange rate not found.', {
+        tenantId,
+        exchangeRateId,
+      });
       throw new ServiceError(ERRORS.EXCHANGE_RATE_NOT_FOUND);
     }
   }
@@ -152,15 +210,26 @@ export default class ExchangeRatesService implements IExchangeRatesService {
    * @param {number[]} exchangeRatesIds - Exchange rates ids.
    * @returns {Promise<void>}
    */
-  private async validateExchangeRatesIdsExistance(tenantId: number, exchangeRatesIds: number[]): Promise<void> {
+  private async validateExchangeRatesIdsExistance(
+    tenantId: number,
+    exchangeRatesIds: number[]
+  ): Promise<void> {
     const { ExchangeRate } = this.tenancy.models(tenantId);
 
-    const storedExchangeRates = await ExchangeRate.query().whereIn('id', exchangeRatesIds);
-    const storedExchangeRatesIds = storedExchangeRates.map((category) => category.id);
-    const notFoundExRates = difference(exchangeRatesIds, storedExchangeRatesIds);
+    const storedExchangeRates = await ExchangeRate.query().whereIn(
+      'id',
+      exchangeRatesIds
+    );
+    const storedExchangeRatesIds = storedExchangeRates.map(
+      (category) => category.id
+    );
+    const notFoundExRates = difference(
+      exchangeRatesIds,
+      storedExchangeRatesIds
+    );
 
     if (notFoundExRates.length > 0) {
       throw new ServiceError(ERRORS.NOT_FOUND_EXCHANGE_RATES);
     }
   }
-}
+}

server/src/services/Inventory/Inventory.ts

@@ -39,7 +39,7 @@ export default class InventoryService {
     direction: TInventoryTransactionDirection,
     date: Date | string,
     lotNumber: number
-  ) {
+  ): IInventoryTransaction[] {
     return itemEntries.map((entry: IItemEntry) => ({
       ...pick(entry, ['itemId', 'quantity', 'rate']),
       lotNumber,
@@ -150,19 +150,36 @@ export default class InventoryService {
    */
   async recordInventoryTransactions(
     tenantId: number,
-    inventoryEntries: IInventoryTransaction[],
-    deleteOld: boolean
+    transactions: IInventoryTransaction[],
+    override: boolean = false
   ): Promise<void> {
-    inventoryEntries.forEach(async (entry: IInventoryTransaction) => {
-      await this.recordInventoryTransaction(tenantId, entry, deleteOld);
+    const bulkInsertOpers = [];
+
+    transactions.forEach((transaction: IInventoryTransaction) => {
+      const oper = this.recordInventoryTransaction(
+        tenantId,
+        transaction,
+        override
+      );
+      bulkInsertOpers.push(oper);
     });
+    const inventoryTransactions = await Promise.all(bulkInsertOpers);
+
+    // Triggers `onInventoryTransactionsCreated` event.
+    this.eventDispatcher.dispatch(
+      events.inventory.onInventoryTransactionsCreated,
+      {
+        tenantId,
+        inventoryTransactions,
+      }
+    );
   }
 
   /**
-   * Writes the inventory transactiosn on the storage from the given 
+   * Writes the inventory transactiosn on the storage from the given
    * inventory transactions entries.
-   * 
-   * @param {number} tenantId - 
+   *
+   * @param {number} tenantId -
    * @param {IInventoryTransaction} inventoryEntry -
    * @param {boolean} deleteOld -
    */
@@ -203,7 +220,7 @@ export default class InventoryService {
     transactionDirection: TInventoryTransactionDirection,
     override: boolean = false
   ): Promise<void> {
-    // Gets the next inventory lot number.
+    // Retrieve the next inventory lot number.
     const lotNumber = this.getNextLotNumber(tenantId);
 
     // Loads the inventory items entries of the given sale invoice.
@@ -231,20 +248,6 @@ export default class InventoryService {
     );
     // Increment and save the next lot number settings.
     await this.incrementNextLotNumber(tenantId);
-
-    // Triggers `onInventoryTransactionsCreated` event.
-    this.eventDispatcher.dispatch(
-      events.inventory.onInventoryTransactionsCreated,
-      {
-        tenantId,
-        inventoryEntries,
-        transactionId,
-        transactionType,
-        transactionDate,
-        transactionDirection,
-        override,
-      }
-    );
   }
 
   /**
@@ -253,7 +256,7 @@ export default class InventoryService {
    * @param {string} transactionType
    * @param {number} transactionId
    * @return {Promise<{
- *    oldInventoryTransactions: IInventoryTransaction[]
+   *    oldInventoryTransactions: IInventoryTransaction[]
    * }>}
    */
   async deleteInventoryTransactions(
@@ -261,7 +264,9 @@ export default class InventoryService {
     transactionId: number,
     transactionType: string
   ): Promise<{ oldInventoryTransactions: IInventoryTransaction[] }> {
-    const { inventoryTransactionRepository } = this.tenancy.repositories(tenantId);
+    const { inventoryTransactionRepository } = this.tenancy.repositories(
+      tenantId
+    );
 
     // Retrieve the inventory transactions of the given sale invoice.
     const oldInventoryTransactions = await inventoryTransactionRepository.find({

server/src/services/Inventory/InventoryAdjustmentService.ts

@@ -11,11 +11,13 @@ import {
   IPaginationMeta,
   IInventoryAdjustmentsFilter,
   ISystemUser,
+  IInventoryTransaction,
 } from 'interfaces';
 import events from 'subscribers/events';
 import AccountsService from 'services/Accounts/AccountsService';
 import ItemsService from 'services/Items/ItemsService';
 import HasTenancyService from 'services/Tenancy/TenancyService';
+import InventoryService from './Inventory';
 
 const ERRORS = {
   INVENTORY_ADJUSTMENT_NOT_FOUND: 'INVENTORY_ADJUSTMENT_NOT_FOUND',
@@ -39,6 +41,9 @@ export default class InventoryAdjustmentService {
   @EventDispatcher()
   eventDispatcher: EventDispatcherInterface;
 
+  @Inject()
+  inventoryService: InventoryService;
+
   /**
    * Transformes the quick inventory adjustment DTO to model object.
    * @param {IQuickInventoryAdjustmentDTO} adjustmentDTO -
@@ -55,14 +60,15 @@ export default class InventoryAdjustmentService {
         {
           index: 1,
           itemId: adjustmentDTO.itemId,
-          ...(['increment', 'decrement'].indexOf(adjustmentDTO.type) !== -1
-            ? {
-                quantity: adjustmentDTO.quantity,
-              }
-            : {}),
           ...('increment' === adjustmentDTO.type
             ? {
-                cost: adjustmentDTO.cost,
+              quantity: adjustmentDTO.quantity,
+              cost: adjustmentDTO.cost,
+              }
+            : {}),
+          ...('decrement' === adjustmentDTO.type
+            ? {
+                quantity: adjustmentDTO.quantity,
               }
             : {}),
         },
@@ -138,6 +144,7 @@ export default class InventoryAdjustmentService {
       quickAdjustmentDTO,
       authorizedUser
     );
+    // Saves the inventory adjustment with assocaited entries to the storage.
     const inventoryAdjustment = await InventoryAdjustment.query().upsertGraph({
       ...invAdjustmentObject,
     });
@@ -146,6 +153,8 @@ export default class InventoryAdjustmentService {
       events.inventoryAdjustment.onQuickCreated,
       {
         tenantId,
+        inventoryAdjustment,
+        inventoryAdjustmentId: inventoryAdjustment.id,
       }
     );
     this.logger.info(
@@ -192,6 +201,7 @@ export default class InventoryAdjustmentService {
     // Triggers `onInventoryAdjustmentDeleted` event.
     await this.eventDispatcher.dispatch(events.inventoryAdjustment.onDeleted, {
       tenantId,
+      inventoryAdjustmentId,
     });
     this.logger.info(
       '[inventory_adjustment] the adjustment deleted successfully.',
@@ -226,4 +236,61 @@ export default class InventoryAdjustmentService {
       pagination,
     };
   }
+
+  /**
+   * Writes the inventory transactions from the inventory adjustment transaction.
+   * @param  {number} tenantId
+   * @param  {IInventoryAdjustment} inventoryAdjustment
+   * @return {Promise<void>}
+   */
+  async writeInventoryTransactions(
+    tenantId: number,
+    inventoryAdjustment: IInventoryAdjustment,
+    override: boolean = false,
+  ): Promise<void> {
+    // Gets the next inventory lot number.
+    const lotNumber = this.inventoryService.getNextLotNumber(tenantId);
+
+    const commonTransaction = {
+      direction: inventoryAdjustment.inventoryDirection,
+      date: inventoryAdjustment.date,
+      transactionType: 'InventoryAdjustment',
+      transactionId: inventoryAdjustment.id,
+    };
+    const inventoryTransactions = [];
+
+    inventoryAdjustment.entries.forEach((entry) => {
+      inventoryTransactions.push({
+        ...commonTransaction,
+        itemId: entry.itemId,
+        quantity: entry.quantity,
+        rate: entry.cost,
+        lotNumber,
+      });
+    });
+    // Saves the given inventory transactions to the storage.
+    this.inventoryService.recordInventoryTransactions(
+      tenantId,
+      inventoryTransactions,
+      override
+    );
+    // Increment and save the next lot number settings.
+    await this.inventoryService.incrementNextLotNumber(tenantId);
+  }
+
+  /**
+   * Reverts the inventory transactions from the inventory adjustment transaction.
+   * @param {number} tenantId
+   * @param {number} inventoryAdjustmentId
+   */
+  async revertInventoryTransactions(
+    tenantId: number,
+    inventoryAdjustmentId: number
+  ): Promise<{ oldInventoryTransactions: IInventoryTransaction[] }> {
+    return this.inventoryService.deleteInventoryTransactions(
+      tenantId,
+      inventoryAdjustmentId,
+      'InventoryAdjustment'
+    );
+  }
 }

server/src/services/Items/ItemsService.ts

@@ -10,6 +10,7 @@ import DynamicListingService from 'services/DynamicListing/DynamicListService';
 import TenancyService from 'services/Tenancy/TenancyService';
 import { ServiceError } from 'exceptions';
 import InventoryService from 'services/Inventory/Inventory';
+import InventoryAdjustmentEntry from 'models/InventoryAdjustmentEntry';
 
 const ERRORS = {
   NOT_FOUND: 'NOT_FOUND',
@@ -27,6 +28,8 @@ const ERRORS = {
 
   ITEMS_HAVE_ASSOCIATED_TRANSACTIONS: 'ITEMS_HAVE_ASSOCIATED_TRANSACTIONS',
   ITEM_HAS_ASSOCIATED_TRANSACTINS: 'ITEM_HAS_ASSOCIATED_TRANSACTINS',
+
+  ITEM_HAS_ASSOCIATED_INVENTORY_ADJUSTMENT: 'ITEM_HAS_ASSOCIATED_INVENTORY_ADJUSTMENT',
 };
 
 @Service()
@@ -52,7 +55,7 @@ export default class ItemsService implements IItemsService {
    * @param {number} itemId
    * @return {Promise<void>}
    */
-  private async getItemOrThrowError(
+  public async getItemOrThrowError(
     tenantId: number,
     itemId: number
   ): Promise<void> {
@@ -235,16 +238,10 @@ export default class ItemsService implements IItemsService {
    * @return {IItem}
    */
   private transformNewItemDTOToModel(itemDTO: IItemDTO) {
-    const inventoryAttrs = ['openingQuantity', 'openingCost', 'openingDate'];
-
     return {
-      ...omit(itemDTO, inventoryAttrs),
-      ...(itemDTO.type === 'inventory' ? pick(itemDTO, inventoryAttrs) : {}),
+      ...itemDTO,
       active: defaultTo(itemDTO.active, 1),
-      quantityOnHand:
-        itemDTO.type === 'inventory'
-          ? defaultTo(itemDTO.openingQuantity, 0)
-          : null,
+      quantityOnHand: itemDTO.type === 'inventory' ? 0 : null,
     };
   }
 
@@ -282,7 +279,7 @@ export default class ItemsService implements IItemsService {
       );
     }
     const item = await Item.query().insertAndFetch({
-      ...this.transformNewItemDTOToModel(itemDTO)
+      ...this.transformNewItemDTOToModel(itemDTO),
     });
     this.logger.info('[items] item inserted successfully.', {
       tenantId,
@@ -297,46 +294,6 @@ export default class ItemsService implements IItemsService {
     return item;
   }
 
-  /**
-   * Records the opening items inventory transaction.
-   * @param {number} tenantId -
-   * @param itemId -
-   * @param openingQuantity -
-   * @param openingCost -
-   * @param openingDate -
-   */
-  public async recordOpeningItemsInventoryTransaction(
-    tenantId: number,
-    itemId: number,
-    openingQuantity: number,
-    openingCost: number,
-    openingDate: Date
-  ): Promise<void> {
-    // Gets the next inventory lot number.
-    const lotNumber = this.inventoryService.getNextLotNumber(tenantId);
-
-    // Records the inventory transaction.
-    const inventoryTransaction = await this.inventoryService.recordInventoryTransaction(
-      tenantId,
-      {
-        date: openingDate,
-        quantity: openingQuantity,
-        rate: openingCost,
-        direction: 'IN',
-        transactionType: 'OpeningItem',
-        itemId,
-        lotNumber,
-      }
-    );
-    // Records the inventory cost lot transaction.
-    await this.inventoryService.recordInventoryCostLotTransaction(tenantId, {
-      ...omit(inventoryTransaction, ['updatedAt', 'createdAt']),
-      cost: openingQuantity * openingCost,
-      remaining: 0,
-    });
-    await this.inventoryService.incrementNextLotNumber(tenantId);
-  }
-
   /**
    * Edits the item metadata.
    * @param {number} tenantId
@@ -398,16 +355,19 @@ export default class ItemsService implements IItemsService {
    */
   public async deleteItem(tenantId: number, itemId: number) {
     const { Item } = this.tenancy.models(tenantId);
-
     this.logger.info('[items] trying to delete item.', { tenantId, itemId });
 
     // Retreive the given item or throw not found service error.
     await this.getItemOrThrowError(tenantId, itemId);
 
+    // Validate the item has no associated inventory transactions.
+    await this.validateHasNoInventoryAdjustments(tenantId, itemId); 
+
     // Validate the item has no associated invoices or bills.
     await this.validateHasNoInvoicesOrBills(tenantId, itemId);
-
+    
     await Item.query().findById(itemId).delete();
+
     this.logger.info('[items] deleted successfully.', { tenantId, itemId });
   }
 
@@ -518,6 +478,9 @@ export default class ItemsService implements IItemsService {
     // Validates the given items exist on the storage.
     await this.validateItemsIdsExists(tenantId, itemsIds);
 
+    // Validate the item has no associated inventory transactions.
+    await this.validateHasNoInventoryAdjustments(tenantId, itemsIds); 
+
     // Validate the items have no associated invoices or bills.
     await this.validateHasNoInvoicesOrBills(tenantId, itemsIds);
 
@@ -541,7 +504,6 @@ export default class ItemsService implements IItemsService {
       Item,
       itemsFilter
     );
-
     const { results, pagination } = await Item.query()
       .onBuild((builder) => {
         builder.withGraphFetched('inventoryAccount');
@@ -584,4 +546,24 @@ export default class ItemsService implements IItemsService {
       );
     }
   }
+
+  /**
+   * Validates the given item has no associated inventory adjustment transactions.
+   * @param {number} tenantId -
+   * @param {number} itemId -
+   */
+  private async validateHasNoInventoryAdjustments(
+    tenantId: number,
+    itemId: number[] | number,
+  ): Promise<void> {
+    const { InventoryAdjustmentEntry } = this.tenancy.models(tenantId);
+    const itemsIds = Array.isArray(itemId) ? itemId : [itemId];
+
+    const inventoryAdjEntries = await InventoryAdjustmentEntry.query()
+      .whereIn('item_id', itemsIds);
+    
+    if (inventoryAdjEntries.length > 0) {
+      throw new ServiceError(ERRORS.ITEM_HAS_ASSOCIATED_INVENTORY_ADJUSTMENT);
+    }
+  }
 }

server/src/services/Sales/SalesInvoicesCost.ts

@@ -1,8 +1,10 @@
 import { Container, Service, Inject } from 'typedi';
+import { chain } from 'lodash';
+import moment from 'moment';
 import JournalPoster from 'services/Accounting/JournalPoster';
 import InventoryService from 'services/Inventory/Inventory';
 import TenancyService from 'services/Tenancy/TenancyService';
-import { IInventoryLotCost, IItem } from 'interfaces';
+import { IInventoryLotCost, IInventoryTransaction, IItem } from 'interfaces';
 import JournalCommands from 'services/Accounting/JournalCommands';
 
 @Service()
@@ -24,7 +26,7 @@ export default class SaleInvoicesCost {
     tenantId: number,
     inventoryItemsIds: number[],
     startingDate: Date
-  ) {
+  ): Promise<void> {
     const asyncOpers: Promise<[]>[] = [];
 
     inventoryItemsIds.forEach((inventoryItemId: number) => {
@@ -35,7 +37,61 @@ export default class SaleInvoicesCost {
       );
       asyncOpers.push(oper);
     });
-    return Promise.all([...asyncOpers]);
+    await Promise.all([...asyncOpers]);
+  }
+
+  /**
+   * Retrieve the max dated inventory transactions in the transactions that
+   * have the same item id.
+   * @param {IInventoryTransaction[]} inventoryTransactions
+   * @return {IInventoryTransaction[]}
+   */
+  getMaxDateInventoryTransactions(
+    inventoryTransactions: IInventoryTransaction[]
+  ): IInventoryTransaction[] {
+    return chain(inventoryTransactions)
+      .reduce((acc: any, transaction) => {
+        const compatatorDate = acc[transaction.itemId];
+
+        if (
+          !compatatorDate ||
+          moment(compatatorDate.date).isBefore(transaction.date)
+        ) {
+          return {
+            ...acc,
+            [transaction.itemId]: {
+              ...transaction,
+            },
+          };
+        }
+        return acc;
+      }, {})
+      .values()
+      .value();
+  }
+
+  /**
+   * Computes items costs by the given inventory transaction.
+   * @param {number} tenantId
+   * @param {IInventoryTransaction[]} inventoryTransactions
+   */
+  async computeItemsCostByInventoryTransactions(
+    tenantId: number,
+    inventoryTransactions: IInventoryTransaction[]
+  ) {
+    const asyncOpers: Promise<[]>[] = [];
+    const reducedTransactions = this.getMaxDateInventoryTransactions(
+      inventoryTransactions
+    );
+    reducedTransactions.forEach((transaction) => {
+      const oper: Promise<[]> = this.inventoryService.scheduleComputeItemCost(
+        tenantId,
+        transaction.itemId,
+        transaction.date
+      );
+      asyncOpers.push(oper);
+    });
+    await Promise.all([...asyncOpers]);
   }
 
   /**
@@ -90,7 +146,7 @@ export default class SaleInvoicesCost {
     return Promise.all([
       journal.deleteEntries(),
       journal.saveEntries(),
-      journal.saveBalance()
+      journal.saveBalance(),
     ]);
   }
 }

server/src/subscribers/Inventory/Inventory.ts

@@ -43,19 +43,13 @@ export class InventorySubscriber {
   @On(events.inventory.onInventoryTransactionsCreated)
   async handleScheduleItemsCostOnInventoryTransactionsCreated({
     tenantId,
-    inventoryEntries,
-    transactionId,
-    transactionType,
-    transactionDate,
-    transactionDirection,
-    override
+    inventoryTransactions
   }) {
-    const inventoryItemsIds = map(inventoryEntries, 'itemId');
+    const inventoryItemsIds = map(inventoryTransactions, 'itemId');
 
-    await this.saleInvoicesCost.scheduleComputeCostByItemsIds(
+    await this.saleInvoicesCost.computeItemsCostByInventoryTransactions(
       tenantId,
-      inventoryItemsIds,
-      transactionDate,
+      inventoryTransactions
     );
   }
 
@@ -69,6 +63,12 @@ export class InventorySubscriber {
     transactionId,
     oldInventoryTransactions
   }) {
+    // Ignore compute item cost with theses transaction types.
+    const ignoreWithTransactionTypes = ['OpeningItem'];
+
+    if (ignoreWithTransactionTypes.indexOf(transactionType) !== -1) {
+      return;
+    }
     const inventoryItemsIds = map(oldInventoryTransactions, 'itemId');
     const startingDates = map(oldInventoryTransactions, 'date');
     const startingDate = head(startingDates);

server/src/subscribers/Inventory/InventoryAdjustment.ts

@@ -0,0 +1,49 @@
+import { Container } from 'typedi';
+import { On, EventSubscriber } from 'event-dispatch';
+import events from 'subscribers/events';
+import TenancyService from 'services/Tenancy/TenancyService';
+import InventoryAdjustmentService from 'services/Inventory/InventoryAdjustmentService';
+
+@EventSubscriber()
+export default class InventoryAdjustmentsSubscriber {
+  logger: any;
+  tenancy: TenancyService;
+  inventoryAdjustment: InventoryAdjustmentService;
+
+  /**
+   * Constructor method.
+   */
+  constructor() {
+    this.logger = Container.get('logger');
+    this.tenancy = Container.get(TenancyService);
+    this.inventoryAdjustment = Container.get(InventoryAdjustmentService);
+  }
+
+  /**
+   * Handles writing inventory transactions once the quick adjustment created.
+   */
+  @On(events.inventoryAdjustment.onQuickCreated)
+  async handleWriteInventoryTransactionsOnceQuickCreated({
+    tenantId,
+    inventoryAdjustment,
+  }) {
+    await this.inventoryAdjustment.writeInventoryTransactions(
+      tenantId,
+      inventoryAdjustment
+    )
+  }
+
+  /**
+   * Handles reverting invetory transactions once the inventory adjustment deleted.
+   */
+  @On(events.inventoryAdjustment.onDeleted)
+  async handleRevertInventoryTransactionsOnceDeleted({
+    tenantId,
+    inventoryAdjustmentId
+  }) {
+    await this.inventoryAdjustment.revertInventoryTransactions(
+      tenantId,
+      inventoryAdjustmentId,
+    );
+  }
+}