diff --git a/server/src/database/migrations/20200719153909_create_bills_payments_table.js b/server/src/database/migrations/20200719153909_create_bills_payments_table.js
index 8cddb3163..e069d0472 100644
--- a/server/src/database/migrations/20200719153909_create_bills_payments_table.js
+++ b/server/src/database/migrations/20200719153909_create_bills_payments_table.js
@@ -2,6 +2,8 @@
 exports.up = function(knex) {
   return knex.schema.createTable('bills_payments', table => {
     table.increments();
+    table.integer('vendor_id').unsigned();
+    table.decimal('amount', 13, 3).defaultTo(0);
     table.integer('payment_account_id');
     table.string('payment_number');
     table.date('payment_date');
diff --git a/server/src/http/controllers/Purchases/Bills.js b/server/src/http/controllers/Purchases/Bills.js
index 6be018720..cf81b57ab 100644
--- a/server/src/http/controllers/Purchases/Bills.js
+++ b/server/src/http/controllers/Purchases/Bills.js
@@ -250,7 +250,7 @@ export default class BillsController extends BaseController {
    */
   static async getBill(req, res) {
     const { id: billId } = req.params;
-    const bill = await BillsService.getBill(billId);
+    const bill = await BillsService.getBillWithMetadata(billId);
 
     return res.status(200).send({ bill });
   }
@@ -324,6 +324,7 @@ export default class BillsController extends BaseController {
     const bills = await Bill.query()
       .onBuild((builder) => {
         dynamicListing.buildQuery()(builder);
+        builder.withGraphFetched('vendor');
         return builder;
       })
       .pagination(filter.page - 1, filter.page_size);
diff --git a/server/src/http/controllers/Purchases/BillsPayments.ts b/server/src/http/controllers/Purchases/BillsPayments.ts
index 28489a237..f08db0e45 100644
--- a/server/src/http/controllers/Purchases/BillsPayments.ts
+++ b/server/src/http/controllers/Purchases/BillsPayments.ts
@@ -1,6 +1,7 @@
 
 import { Router } from 'express';
 import { check, param, query, ValidationChain } from 'express-validator';
+import { difference } from 'lodash';
 import asyncMiddleware from '@/http/middleware/asyncMiddleware';
 import validateMiddleware from '@/http/middleware/validateMiddleware';
 import BaseController from '@/http/controllers/BaseController';
@@ -40,6 +41,7 @@ export default class BillsPayments extends BaseController {
       asyncMiddleware(this.validateBillPaymentVendorExistance),
       asyncMiddleware(this.validatePaymentAccount),
       asyncMiddleware(this.validatePaymentNumber),
+      asyncMiddleware(this.validateEntriesIdsExistance),
       asyncMiddleware(this.validateEntriesBillsExistance),
       asyncMiddleware(this.validateVendorsDueAmount),
       asyncMiddleware(this.editBillPayment),
@@ -117,10 +119,12 @@ export default class BillsPayments extends BaseController {
    * @param {Function} next 
    */
   static async validateBillPaymentExistance(req: Request, res: Response, next: any ) {
-    const foundBillPayment = await BillPaymentsService.isBillPaymentExists(req.params.id);
+    const { id: billPaymentId } = req.params;
+    const { BillPayment } = req.models;
+    const foundBillPayment = await BillPayment.query().findById(billPaymentId);
 
     if (!foundBillPayment) {
-      return res.status(404).sned({
+      return res.status(404).send({
         errors: [{ type: 'BILL.PAYMENT.NOT.FOUND', code: 100 }],
       });
     }
@@ -178,8 +182,11 @@ export default class BillsPayments extends BaseController {
     const billPayment = { ...req.body };
     const entriesBillsIds = billPayment.entries.map((e: any) => e.bill_id);
 
-    const notFoundBillsIds = await Bill.getNotFoundBills(entriesBillsIds);
-
+    // Retrieve not found bills that associated to the given vendor id.
+    const notFoundBillsIds = await Bill.getNotFoundBills(
+      entriesBillsIds,
+      billPayment.vendor_id,
+    );
     if (notFoundBillsIds.length > 0) {
       return res.status(400).send({
         errors: [{ type: 'BILLS.IDS.NOT.EXISTS', code: 600 }],
@@ -227,6 +234,34 @@ export default class BillsPayments extends BaseController {
     next();
   }
 
+  /**
+   * Validate the payment receive entries IDs existance. 
+   * @param {Request} req 
+   * @param {Response} res 
+   * @return {Response}
+   */
+  static async validateEntriesIdsExistance(req: Request, res: Response, next: Function) {
+    const { BillPaymentEntry } = req.models;
+
+    const billPayment = { id: req.params.id, ...req.body };
+    const entriesIds = billPayment.entries
+      .filter((entry: any) => entry.id)
+      .map((entry: any) => entry.id);
+
+    const storedEntries = await BillPaymentEntry.tenant().query()
+      .where('bill_payment_id', billPayment.id);
+
+    const storedEntriesIds = storedEntries.map((entry: any) => entry.id);    
+    const notFoundEntriesIds = difference(entriesIds, storedEntriesIds);
+
+    if (notFoundEntriesIds.length > 0) {
+      return res.status(400).send({
+        errors: [{ type: 'ENTEIES.IDS.NOT.FOUND', code: 800 }],
+      });
+    }
+    next();
+  }
+
   /**
    * Creates a bill payment.
    * @async
@@ -268,8 +303,16 @@ export default class BillsPayments extends BaseController {
     return res.status(200).send({ id: billPaymentId });
   }
 
+  /**
+   * Retrieve the bill payment.
+   * @param {Request} req 
+   * @param {Response} res 
+   */
   static async getBillPayment(req: Request, res: Response) {
+    const { id: billPaymentId } = req.params;
+    const billPayment = await BillPaymentsService.getBillPaymentWithMetadata(billPaymentId);
 
+    return res.status(200).send({ bill_payment: { ...billPayment } });
   }
 
   /**
@@ -341,15 +384,22 @@ export default class BillsPayments extends BaseController {
     }
     const billPayments = await BillPayment.query().onBuild((builder) => {
       dynamicListing.buildQuery()(builder);
+      builder.withGraphFetched('vendor');
+      builder.withGraphFetched('paymentAccount');
       return builder;
-    });
+    }).pagination(filter.page - 1, filter.page_size);
+
     return res.status(200).send({
-      billPayments,
-      ...(viewMeta
-        ? {
-            customViewId: viewMeta.id,
+      bill_payments: {
+        ...billPayments,
+        ...(viewMeta
+          ? {
+            view_meta: {
+              customViewId: viewMeta.id,
+            },
           }
-        : {}),
+          : {}),
+      },
     });
   }
 }
\ No newline at end of file
diff --git a/server/src/http/controllers/Sales/PaymentReceives.js b/server/src/http/controllers/Sales/PaymentReceives.js
index 19199e834..632eadc5f 100644
--- a/server/src/http/controllers/Sales/PaymentReceives.js
+++ b/server/src/http/controllers/Sales/PaymentReceives.js
@@ -151,9 +151,11 @@ export default class PaymentReceivesController extends BaseController {
    * @param {Function} next -
    */
   static async validateInvoicesIDs(req, res, next) {
-    const invoicesIds = req.body.entries.map((e) => e.invoice_id);
+    const paymentReceive = { ...req.body };
+    const invoicesIds = paymentReceive.entries.map((e) => e.invoice_id);
     const notFoundInvoicesIDs = await SaleInvoicesService.isInvoicesExist(
-      invoicesIds
+      invoicesIds,
+      paymentReceive.customer_id,
     );
     if (notFoundInvoicesIDs.length > 0) {
       return res.status(400).send({
@@ -376,7 +378,7 @@ export default class PaymentReceivesController extends BaseController {
     if (filter.stringified_filter_roles) {
       filter.filter_roles = JSON.parse(filter.stringified_filter_roles);
     }
-    const { Resource, PaymentReceive, View } = req.models;
+    const { Resource, PaymentReceive, View, Bill } = req.models;
     const resource = await Resource.query()
         .remember()
         .where('name', 'payment_receives')
diff --git a/server/src/http/controllers/Sales/SalesInvoices.js b/server/src/http/controllers/Sales/SalesInvoices.js
index 1598d3706..efab8d8bd 100644
--- a/server/src/http/controllers/Sales/SalesInvoices.js
+++ b/server/src/http/controllers/Sales/SalesInvoices.js
@@ -368,6 +368,7 @@ export default class SaleInvoicesController {
     }
     const salesInvoices = await SaleInvoice.query().onBuild((builder) => {
       builder.withGraphFetched('entries');
+      builder.withGraphFetched('customer');
       dynamicListing.buildQuery()(builder);
     }).pagination(filter.page - 1, filter.page_size);
 
diff --git a/server/src/models/Bill.js b/server/src/models/Bill.js
index 484e2bb9e..0586f6897 100644
--- a/server/src/models/Bill.js
+++ b/server/src/models/Bill.js
@@ -37,12 +37,55 @@ export default class Bill extends mixin(TenantModel, [CachableModel]) {
   }
 
   /**
-   * Retrieve the not found bills ids as array.
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const Vendor = require('@/models/Vendor');
+    const ItemEntry = require('@/models/ItemEntry');
+
+    return {
+      /**
+       *
+       */
+      vendor: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: this.relationBindKnex(Vendor.default),
+        join: {
+          from: 'bills.vendorId',
+          to: 'vendors.id',
+        },
+      },
+
+      /**
+       * 
+       */
+      entries: {
+        relation: Model.HasManyRelation,
+        modelClass: this.relationBindKnex(ItemEntry.default),
+        join: {
+          from: 'bills.id',
+          to: 'items_entries.referenceId',
+        },
+      },
+    };
+  }
+
+  /**
+   * Retrieve the not found bills ids as array that associated to the given vendor.
    * @param {Array} billsIds 
+   * @param {number} vendorId - 
    * @return {Array}
    */
-  static async getNotFoundBills(billsIds) {
-    const storedBills = await this.tenant().query().whereIn('id', billsIds);
+  static async getNotFoundBills(billsIds, vendorId) {
+    const storedBills = await this.tenant().query()
+      .onBuild((builder) => {
+        builder.whereIn('id', billsIds);
+
+        if (vendorId) {
+          builder.where('vendor_id', vendorId);
+        }
+      });
+      
     const storedBillsIds = storedBills.map((t) => t.id);
 
     const notFoundBillsIds = difference(
@@ -51,4 +94,12 @@ export default class Bill extends mixin(TenantModel, [CachableModel]) {
     );
     return notFoundBillsIds;
   }
+
+  static changePaymentAmount(billId, amount) {
+    const changeMethod = amount > 0 ? 'increment' : 'decrement';
+    return this.tenant()
+      .query()
+      .where('id', billId)
+      [changeMethod]('payment_amount', Math.abs(amount));
+  }
 }
diff --git a/server/src/models/BillPayment.js b/server/src/models/BillPayment.js
index c417fd55a..2ca657e8c 100644
--- a/server/src/models/BillPayment.js
+++ b/server/src/models/BillPayment.js
@@ -19,40 +19,27 @@ export default class BillPayment extends mixin(TenantModel, [CachableModel]) {
     return ['createdAt', 'updatedAt'];
   }
 
-  /**
-   * Extend query builder model.
-   */
-  static get QueryBuilder() {
-    return CachableQueryBuilder;
-  }
-
-  static changePaymentAmount(billId, amount) {
-    const changeMethod = amount > 0 ? 'increment' : 'decrement';
-    return this.tenant()
-      .query()
-      .where('id', billId)
-      [changeMethod]('payment_amount', Math.abs(amount));
-  }
-
   /**
    * Relationship mapping.
    */
   static get relationMappings() {
     const BillPaymentEntry = require('@/models/BillPaymentEntry');
     const Vendor = require('@/models/Vendor');
+    const Account = require('@/models/Account');
 
     return {
       /**
        * 
        */
       entries: {
-        relation: Model.BelongsToOneRelation,
+        relation: Model.HasManyRelation,
         modelClass: this.relationBindKnex(BillPaymentEntry.default),
         join: {
           from: 'bills_payments.id',
           to: 'bills_payments_entries.billPaymentId',
         },
       },
+
       /**
        * 
        */
@@ -63,7 +50,19 @@ export default class BillPayment extends mixin(TenantModel, [CachableModel]) {
           from: 'bills_payments.vendorId',
           to: 'vendors.id',
         },
-      }
+      },
+
+      /**
+       * 
+       */
+      paymentAccount: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: this.relationBindKnex(Account.default),
+        join: {
+          from: 'bills_payments.paymentAccountId',
+          to: 'accounts.id',
+        },
+      },
     };
   }
 }
diff --git a/server/src/models/BillPaymentEntry.js b/server/src/models/BillPaymentEntry.js
index 39efdc1c0..de1bbe6a1 100644
--- a/server/src/models/BillPaymentEntry.js
+++ b/server/src/models/BillPaymentEntry.js
@@ -13,6 +13,6 @@ export default class BillPaymentEntry extends TenantModel {
    * Timestamps columns.
    */
   get timestamps() {
-    return ['createdAt', 'updatedAt'];
+    return [];
   }
 }
diff --git a/server/src/models/SaleInvoice.js b/server/src/models/SaleInvoice.js
index d08efb8bd..96114cff6 100644
--- a/server/src/models/SaleInvoice.js
+++ b/server/src/models/SaleInvoice.js
@@ -38,8 +38,12 @@ export default class SaleInvoice extends mixin(TenantModel, [CachableModel]) {
    */
   static get relationMappings() {
     const ItemEntry = require('@/models/ItemEntry');
+    const Customer = require('@/models/Customer');
 
     return {
+      /**
+       * 
+       */
       entries: {
         relation: Model.HasManyRelation,
         modelClass: this.relationBindKnex(ItemEntry.default),
@@ -48,6 +52,18 @@ export default class SaleInvoice extends mixin(TenantModel, [CachableModel]) {
           to: 'items_entries.referenceId',
         },
       },
+
+      /**
+       * 
+       */
+      customer: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: this.relationBindKnex(Customer.default),
+        join: {
+          from: 'sales_invoices.customerId',
+          to: 'customers.id',
+        },
+      },
     };
   }
 
@@ -64,4 +80,6 @@ export default class SaleInvoice extends mixin(TenantModel, [CachableModel]) {
       .where('id', invoiceId)
       [changeMethod]('payment_amount', Math.abs(amount));      
   }
+
+
 }
diff --git a/server/src/services/Purchases/BillPayments.js b/server/src/services/Purchases/BillPayments.js
index 6f2ff9aae..49d7e8478 100644
--- a/server/src/services/Purchases/BillPayments.js
+++ b/server/src/services/Purchases/BillPayments.js
@@ -1,17 +1,30 @@
 import express from 'express';
 import { omit, sumBy } from 'lodash';
-import { BillPayment, BillPaymentEntry, Vendor } from '@/models';
-import ServiceItemsEntries from '../Sales/ServiceItemsEntries';
-import AccountsService from '../Accounts/AccountsService';
-import JournalPoster from '../Accounting/JournalPoster';
-import JournalEntry from '../Accounting/JournalEntry';
+import moment from 'moment';
+import {
+  BillPayment,
+  BillPaymentEntry,
+  Vendor,
+  Bill,
+  Account,
+  AccountTransaction,
+} from '@/models';
+import ServiceItemsEntries from '@/services/Sales/ServiceItemsEntries';
+import AccountsService from '@/services/Accounts/AccountsService';
+import JournalPoster from '@/services/Accounting/JournalPoster';
+import JournalEntry from '@/services/Accounting/JournalEntry';
+import JournalPosterService from '@/services/Sales/JournalPosterService';
 
+/**
+ * Bill payments service.
+ * @service
+ */
 export default class BillPaymentsService {
   /**
    * Creates a new bill payment transcations and store it to the storage
    * with associated bills entries and journal transactions.
    *
-   * Precedures
+   * Precedures:-
    * ------
    * - Records the bill payment transaction.
    * - Records the bill payment associated entries.
@@ -22,7 +35,7 @@ export default class BillPaymentsService {
    * @param {IBillPayment} billPayment
    */
   static async createBillPayment(billPayment) {
-    const amount = sumBy(billPayment.entries, 'paymentAmount');
+    const amount = sumBy(billPayment.entries, 'payment_amount');
     const storedBillPayment = await BillPayment.tenant()
       .query()
       .insert({
@@ -39,17 +52,17 @@ export default class BillPaymentsService {
           ...entry,
         });
       // Increment the bill payment amount.
-      const billOper = BillPayment.changePaymentAmount(
-        entry.billId,
-        entry.paymentAmount
+      const billOper = Bill.changePaymentAmount(
+        entry.bill_id,
+        entry.payment_amount,
       );
       storeOpers.push(billOper);
       storeOpers.push(oper);
     });
     // Decrement the vendor balance after bills payments.
-    const vendorDecrementOper = Vendor.changeBalanace(
+    const vendorDecrementOper = Vendor.changeBalance(
       billPayment.vendor_id,
-      amount * -1
+      amount * -1,
     );
     // Records the journal transactions after bills payment
     // and change diff acoount balance.
@@ -68,8 +81,8 @@ export default class BillPaymentsService {
   /**
    * Edits the details of the given bill payment.
    *
-   * Preceducres.
-   * -------
+   * Preceducres:
+   * ------
    * - Update the bill payment transaction.
    * - Insert the new bill payment entries that have no ids.
    * - Update the bill paymeny entries that have ids.
@@ -145,29 +158,32 @@ export default class BillPaymentsService {
 
   /**
    * Deletes the bill payment and associated transactions.
-   * @param {Integer} billPaymentId - 
+   * @param {Integer} billPaymentId - The given bill payment id.
    * @return {Promise}
    */
   static async deleteBillPayment(billPaymentId) {
     const billPayment = await BillPayment.tenant().query().where('id', billPaymentId).first();
 
-    await BillPayment.tenant().query().where('id', billPaymentId).delete();
+    await BillPayment.tenant().query()
+      .where('id', billPaymentId)
+      .delete();
+
     await BillPaymentEntry.tenant()
       .query()
       .where('bill_payment_id', billPaymentId)
       .delete();
 
-    const deleteTransactionsOper = this.deleteJournalTransactions(
+    const deleteTransactionsOper = JournalPosterService.deleteJournalTransactions(
       billPaymentId,
-      'BillPayment'
+      'BillPayment',
     );
-    const revertVendorBalance = Vendor.changeBalanace(
-      billpayment.vendor_id,
-      billPayment.amount * -1,
+    const revertVendorBalanceOper = Vendor.changeBalance(
+      billPayment.vendorId,
+      billPayment.amount,
     );
     return Promise.all([
       deleteTransactionsOper,
-      revertVendorBalance,
+      revertVendorBalanceOper,
     ]);
   }
 
@@ -207,7 +223,7 @@ export default class BillPaymentsService {
       ...commonJournal,
       debit: paymentAmount,
       contactType: 'Vendor',
-      contactId: billpayment.vendor_id,
+      contactId: billPayment.vendor_id,
       account: payableAccount.id,
     });
     const creditPaymentAccount = new JournalEntry({
@@ -225,18 +241,32 @@ export default class BillPaymentsService {
     ]);
   }
 
-  static async getBillPayment(billPaymentId) {
-    
+  /**
+   * Retrieve bill payment with associated metadata.
+   * @param {number} billPaymentId 
+   * @return {object}
+   */
+  static async getBillPaymentWithMetadata(billPaymentId) {
+    const billPayment = await BillPayment.tenant().query()
+      .where('id', billPaymentId)
+      .withGraphFetched('entries')
+      .withGraphFetched('vendor')
+      .withGraphFetched('paymentAccount')
+      .first();
+
+    return billPayment;
   }
 
   /**
    * Detarmines whether the bill payment exists on the storage.
    * @param {Integer} billPaymentId 
+   * @return {boolean}
    */
   static async isBillPaymentExists(billPaymentId) {
     const billPayment = await BillPayment.tenant().query()
       .where('id', billPaymentId)
       .first();
-    return billPayment.length > 0;
+
+    return (billPayment.length > 0);
   }
 }
diff --git a/server/src/services/Purchases/Bills.js b/server/src/services/Purchases/Bills.js
index a03d8946d..bf5ddd857 100644
--- a/server/src/services/Purchases/Bills.js
+++ b/server/src/services/Purchases/Bills.js
@@ -299,4 +299,19 @@ export default class BillsService {
   static getBill(billId) {
     return Bill.tenant().query().where('id', billId).first();
   }
+
+
+  /**
+   * Retrieve the given bill details with associated items entries.
+   * @param {Integer} billId -
+   * @returns {Promise}
+   */
+  static getBillWithMetadata(billId) {
+    return Bill.tenant()
+      .query()
+      .where('id', billId)
+      .withGraphFetched('vendor')
+      .withGraphFetched('entries')
+      .first();
+  }
 }
diff --git a/server/src/services/Sales/HasItemsEntries.ts b/server/src/services/Sales/HasItemsEntries.ts
index 6fb312a82..cc18f7cfe 100644
--- a/server/src/services/Sales/HasItemsEntries.ts
+++ b/server/src/services/Sales/HasItemsEntries.ts
@@ -12,7 +12,12 @@ export default class HasItemEntries {
    *
    * @return {Promise}
    */
-  static async patchItemsEntries(newEntries: Array<any>, oldEntries: Array<any>, referenceType: string, referenceId: string|number) {
+  static async patchItemsEntries(
+    newEntries: Array<any>,
+    oldEntries: Array<any>,
+    referenceType: string,
+    referenceId: string|number
+  ) {
     const entriesHasIds = newEntries.filter((entry) => entry.id);
     const entriesHasNoIds = newEntries.filter((entry) => !entry.id);
     const entriesIds = entriesHasIds.map(entry => entry.id);