feat: advanced payments

packages/server/src/api/controllers/Sales/PaymentReceives.ts

@@ -151,6 +151,8 @@ export default class PaymentReceivesController extends BaseController {
       check('exchange_rate').optional().isFloat({ gt: 0 }).toFloat(),
 
       check('payment_date').exists(),
+      check('amount').exists().isNumeric().toFloat(),
+
       check('reference_no').optional(),
       check('deposit_account_id').exists().isNumeric().toInt(),
       check('payment_receive_no').optional({ nullable: true }).trim().escape(),
@@ -158,15 +160,20 @@ export default class PaymentReceivesController extends BaseController {
 
       check('branch_id').optional({ nullable: true }).isNumeric().toInt(),
 
-      check('entries').isArray({ min: 1 }),
+      check('entries').isArray(),
 
       check('entries.*.id').optional({ nullable: true }).isNumeric().toInt(),
       check('entries.*.index').optional().isNumeric().toInt(),
       check('entries.*.invoice_id').exists().isNumeric().toInt(),
-      check('entries.*.payment_amount').exists().isNumeric().toFloat(),
+      check('entries.*.amount_applied').exists().isNumeric().toFloat(),
 
       check('attachments').isArray().optional(),
       check('attachments.*.key').exists().isString(),
+
+      check('unearned_revenue_account_id')
+        .optional({ nullable: true })
+        .isNumeric()
+        .toInt(),
     ];
   }
 

packages/server/src/database/migrations/20240722085204_amount_applied_column_to_payments_received_table.js

@@ -0,0 +1,19 @@
+exports.up = function (knex) {
+  return knex.schema.table('payment_receives', (table) => {
+    table.decimal('unapplied_amount', 13, 3).defaultTo(0);
+    table.decimal('used_amount', 13, 3).defaultTo(0);
+    table
+      .integer('unearned_revenue_account_id')
+      .unsigned()
+      .references('id')
+      .inTable('accounts');
+  });
+};
+
+exports.down = function (knex) {
+  return knex.schema.table('payment_receives', (table) => {
+    table.dropColumn('unapplied_amount');
+    table.dropColumn('used_amount');
+    table.dropColumn('unearned_revenue_account_id');
+  });
+};

packages/server/src/database/seeds/data/accounts.js

@@ -323,4 +323,24 @@ export default [
     index: 1,
     predefined: 0,
   },
+  {
+    name: 'Unearned Revenue',
+    slug: 'unearned-revenue',
+    account_type: 'other-income',
+    parent_account_id: null,
+    code: '50005',
+    active: true,
+    index: 1,
+    predefined: true,
+  },
+  {
+    name: 'Prepaid Expenses',
+    slug: 'prepaid-expenses',
+    account_type: 'prepaid-expenses',
+    parent_account_id: null,
+    code: '',
+    active: true,
+    index: 1,
+    predefined: true,
+  }
 ];

packages/server/src/interfaces/PaymentReceive.ts

@@ -25,6 +25,7 @@ export interface IPaymentReceive {
   updatedAt: Date;
   localAmount?: number;
   branchId?: number;
+  unearnedRevenueAccountId?: number;
 }
 export interface IPaymentReceiveCreateDTO {
   customerId: number;
@@ -39,6 +40,8 @@ export interface IPaymentReceiveCreateDTO {
 
   branchId?: number;
   attachments?: AttachmentLinkDTO[];
+
+  unearnedRevenueAccountId?: number;
 }
 
 export interface IPaymentReceiveEditDTO {
@@ -69,7 +72,7 @@ export interface IPaymentReceiveEntryDTO {
   index: number;
   paymentReceiveId: number;
   invoiceId: number;
-  paymentAmount: number;
+  amountApplied: number;
 }
 
 export interface IPaymentReceivesFilter extends IDynamicListFilterDTO {

packages/server/src/loaders/eventEmitter.ts

@@ -113,6 +113,8 @@ import { UnlinkBankRuleOnDeleteBankRule } from '@/services/Banking/Rules/events/
 import { DecrementUncategorizedTransactionOnMatching } from '@/services/Banking/Matching/events/DecrementUncategorizedTransactionsOnMatch';
 import { DecrementUncategorizedTransactionOnExclude } from '@/services/Banking/Exclude/events/DecrementUncategorizedTransactionOnExclude';
 import { DecrementUncategorizedTransactionOnCategorize } from '@/services/Cashflow/subscribers/DecrementUncategorizedTransactionOnCategorize';
+import { AutoApplyUnearnedRevenueOnInvoiceCreated } from '@/services/Sales/PaymentReceives/events/AutoApplyUnearnedRevenueOnInvoiceCreated';
+import { AutoApplyPrepardExpensesOnBillCreated } from '@/services/Purchases/Bills/events/AutoApplyPrepardExpensesOnBillCreated';
 
 export default () => {
   return new EventPublisher();
@@ -274,5 +276,9 @@ export const susbcribers = () => {
 
     // Plaid
     RecognizeSyncedBankTranasctions,
+
+    // Advanced Payments 
+    AutoApplyUnearnedRevenueOnInvoiceCreated,
+    AutoApplyPrepardExpensesOnBillCreated
   ];
 };

packages/server/src/services/Purchases/Bills/AutoApplyPrepardExpenses.ts

@@ -0,0 +1,73 @@
+import { Knex } from 'knex';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+import PromisePool from '@supercharge/promise-pool';
+import { Inject, Service } from 'typedi';
+
+@Service()
+export class AutoApplyPrepardExpenses {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  /**
+   * Auto apply prepard expenses to the given bill.
+   * @param {number} tenantId
+   * @param {number} billId
+   * @returns {Promise<void>}
+   */
+  async autoApplyPrepardExpensesToBill(
+    tenantId: number,
+    billId: number,
+    trx?: Knex.Transaction
+  ): Promise<void> {
+    const { PaymentMade, Bill } = this.tenancy.models(tenantId);
+
+    const unappliedPayments = await PaymentMade.query(trx).where(
+      'unappliedAmount',
+      '>',
+      0
+    );
+    const bill = Bill.query(trx).findById(billId).throwIfNotFound();
+
+    await PromisePool.withConcurrency(1)
+      .for(unappliedPayments)
+      .process(async (unappliedPayment: any) => {
+        const appliedAmount = 1;
+
+        await this.applyBillToPaymentMade(
+          tenantId,
+          unappliedPayment.id,
+          bill.id,
+          appliedAmount,
+          trx
+        );
+      });
+
+    // Increase the paid amount of the purchase invoice.
+    await Bill.changePaymentAmount(billId, 0, trx);
+  }
+
+  /**
+   * Apply the given bill to payment made transaction.
+   * @param {number} tenantId
+   * @param {number} billPaymentId
+   * @param {number} billId
+   * @param {number} appliedAmount
+   * @param {Knex.Transaction} trx
+   */
+  public applyBillToPaymentMade = async (
+    tenantId: number,
+    billPaymentId: number,
+    billId: number,
+    appliedAmount: number,
+    trx?: Knex.Transaction
+  ) => {
+    const { BillPaymentEntry, BillPayment } = this.tenancy.models(tenantId);
+
+    await BillPaymentEntry.query(trx).insert({
+      billPaymentId,
+      billId,
+      paymentAmount: appliedAmount,
+    });
+    await BillPayment.query().increment('usedAmount', appliedAmount);
+  };
+}

packages/server/src/services/Purchases/Bills/events/AutoApplyPrepardExpensesOnBillCreated.ts

@@ -0,0 +1,36 @@
+import { Inject, Service } from 'typedi';
+import { AutoApplyPrepardExpenses } from '../AutoApplyPrepardExpenses';
+import events from '@/subscribers/events';
+import { IBillCreatedPayload } from '@/interfaces';
+
+@Service()
+export class AutoApplyPrepardExpensesOnBillCreated {
+  @Inject()
+  private autoApplyPrepardExpenses: AutoApplyPrepardExpenses;
+
+  /**
+   * Constructor method.
+   */
+  public attach(bus) {
+    bus.subscribe(
+      events.saleInvoice.onCreated,
+      this.handleAutoApplyPrepardExpensesOnBillCreated.bind(this)
+    );
+  }
+
+  /**
+   * Handles the auto apply prepard expenses on bill created.
+   * @param {IBillCreatedPayload} payload -
+   */
+  private async handleAutoApplyPrepardExpensesOnBillCreated({
+    tenantId,
+    billId,
+    trx,
+  }: IBillCreatedPayload) {
+    await this.autoApplyPrepardExpenses.autoApplyPrepardExpensesToBill(
+      tenantId,
+      billId,
+      trx
+    );
+  }
+}

packages/server/src/services/Sales/PaymentReceives/AutoApplyUnearnedRevenue.ts

@@ -0,0 +1,75 @@
+import { Inject, Service } from 'typedi';
+import { Knex } from 'knex';
+import PromisePool from '@supercharge/promise-pool';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+
+@Service()
+export class AutoApplyUnearnedRevenue {
+  @Inject()
+  private tenancy: HasTenancyService;
+  /**
+   * Auto apply invoice to advanced payment received transactions.
+   * @param {number} tenantId
+   * @param {number} invoiceId
+   */
+  public async autoApplyUnearnedRevenueToInvoice(
+    tenantId: number,
+    invoiceId: number,
+    trx?: Knex.Transaction
+  ) {
+    const { PaymentReceive, SaleInvoice } = this.tenancy.models(tenantId);
+
+    const unappliedPayments = await PaymentReceive.query(trx).where(
+      'unappliedAmount',
+      '>',
+      0
+    );
+    const invoice = await SaleInvoice.query(trx)
+      .findById(invoiceId)
+      .throwIfNotFound();
+
+    let unappliedAmount = invoice.balance;
+
+    await PromisePool.withConcurrency(1)
+      .for(unappliedPayments)
+      .process(async (unappliedPayment: any) => {
+        const appliedAmount = unappliedAmount;
+
+        await this.applyInvoiceToPaymentReceived(
+          tenantId,
+          unappliedPayment.id,
+          invoice.id,
+          appliedAmount,
+          trx
+        );
+      });
+    // Increase the paid amount of the sale invoice.
+    await SaleInvoice.changePaymentAmount(invoiceId, unappliedAmount, trx);
+  }
+
+  /**
+   * Apply the given invoice to payment received transaction.
+   * @param {number} tenantId
+   * @param {number} paymentReceivedId
+   * @param {number} invoiceId
+   * @param {number} appliedAmount
+   * @param {Knex.Transaction} trx
+   */
+  public applyInvoiceToPaymentReceived = async (
+    tenantId: number,
+    paymentReceiveId: number,
+    invoiceId: number,
+    appliedAmount: number,
+    trx?: Knex.Transaction
+  ) => {
+    const { PaymentReceiveEntry, PaymentReceive } =
+      this.tenancy.models(tenantId);
+
+    await PaymentReceiveEntry.query(trx).insert({
+      paymentReceiveId,
+      invoiceId,
+      paymentAmount: appliedAmount,
+    });
+    await PaymentReceive.query(trx).increment('usedAmount', appliedAmount);
+  };
+}

packages/server/src/services/Sales/PaymentReceives/CreatePaymentReceive.ts

@@ -78,10 +78,10 @@ export class CreatePaymentReceive {
       paymentReceiveDTO.entries
     );
     // Validate invoice payment amount.
-    await this.validators.validateInvoicesPaymentsAmount(
-      tenantId,
-      paymentReceiveDTO.entries
-    );
+    // await this.validators.validateInvoicesPaymentsAmount(
+    //   tenantId,
+    //   paymentReceiveDTO.entries
+    // );
     // Validates the payment account currency code.
     this.validators.validatePaymentAccountCurrency(
       depositAccount.currencyCode,

packages/server/src/services/Sales/PaymentReceives/PaymentReceiveDTOTransformer.ts

@@ -36,7 +36,8 @@ export class PaymentReceiveDTOTransformer {
     paymentReceiveDTO: IPaymentReceiveCreateDTO | IPaymentReceiveEditDTO,
     oldPaymentReceive?: IPaymentReceive
   ): Promise<IPaymentReceive> {
-    const paymentAmount = sumBy(paymentReceiveDTO.entries, 'paymentAmount');
+    const appliedAmount = sumBy(paymentReceiveDTO.entries, 'paymentAmount');
+    const unappliedAmount = paymentReceiveDTO.amount - appliedAmount;
 
     // Retreive the next invoice number.
     const autoNextNumber =
@@ -54,7 +55,7 @@ export class PaymentReceiveDTOTransformer {
       ...formatDateFields(omit(paymentReceiveDTO, ['entries', 'attachments']), [
         'paymentDate',
       ]),
-      amount: paymentAmount,
+      unappliedAmount,
       currencyCode: customer.currencyCode,
       ...(paymentReceiveNo ? { paymentReceiveNo } : {}),
       exchangeRate: paymentReceiveDTO.exchangeRate || 1,

packages/server/src/services/Sales/PaymentReceives/PaymentReceiveGLEntries.ts

@@ -1,19 +1,14 @@
 import { Service, Inject } from 'typedi';
-import { sumBy } from 'lodash';
 import { Knex } from 'knex';
 import Ledger from '@/services/Accounting/Ledger';
 import TenancyService from '@/services/Tenancy/TenancyService';
-import {
-  IPaymentReceive,
-  ILedgerEntry,
-  AccountNormal,
-  IPaymentReceiveGLCommonEntry,
-} from '@/interfaces';
+import { IPaymentReceive, ILedgerEntry, AccountNormal } from '@/interfaces';
 import LedgerStorageService from '@/services/Accounting/LedgerStorageService';
 import { TenantMetadata } from '@/system/models';
+import { PaymentReceivedGLCommon } from './PaymentReceivedGLCommon';
 
 @Service()
-export class PaymentReceiveGLEntries {
+export class PaymentReceiveGLEntries extends PaymentReceivedGLCommon {
   @Inject()
   private tenancy: TenancyService;
 
@@ -22,9 +17,9 @@ export class PaymentReceiveGLEntries {
 
   /**
    * Writes payment GL entries to the storage.
-   * @param   {number} tenantId
-   * @param   {number} paymentReceiveId
-   * @param   {Knex.Transaction} trx
+   * @param {number} tenantId - Tenant id.
+   * @param {number} paymentReceiveId - Payment received id.
+   * @param {Knex.Transaction} trx - Knex transaction.
    * @returns {Promise<void>}
    */
   public writePaymentGLEntries = async (
@@ -34,14 +29,19 @@ export class PaymentReceiveGLEntries {
   ): Promise<void> => {
     const { PaymentReceive } = this.tenancy.models(tenantId);
 
-    // Retrieves the given tenant metadata.
-    const tenantMeta = await TenantMetadata.query().findOne({ tenantId });
-
     // Retrieves the payment receive with associated entries.
     const paymentReceive = await PaymentReceive.query(trx)
       .findById(paymentReceiveId)
       .withGraphFetched('entries.invoice');
 
+      // Cannot continue if the received payment is unearned revenue type,
+      // that type of transactions have different type of GL entries.
+    if (paymentReceive.unearnedRevenueAccountId) {
+      return;
+    }
+    // Retrieves the given tenant metadata.
+    const tenantMeta = await TenantMetadata.query().findOne({ tenantId });
+
     // Retrives the payment receive ledger.
     const ledger = await this.getPaymentReceiveGLedger(
       tenantId,
@@ -53,25 +53,6 @@ export class PaymentReceiveGLEntries {
     await this.ledgerStorage.commit(tenantId, ledger, trx);
   };
 
-  /**
-   * Reverts the given payment receive GL entries.
-   * @param {number} tenantId
-   * @param {number} paymentReceiveId
-   * @param {Knex.Transaction} trx
-   */
-  public revertPaymentGLEntries = async (
-    tenantId: number,
-    paymentReceiveId: number,
-    trx?: Knex.Transaction
-  ) => {
-    await this.ledgerStorage.deleteByReference(
-      tenantId,
-      paymentReceiveId,
-      'PaymentReceive',
-      trx
-    );
-  };
-
   /**
    * Rewrites the given payment receive GL entries.
    * @param {number} tenantId
@@ -92,10 +73,10 @@ export class PaymentReceiveGLEntries {
 
   /**
    * Retrieves the payment receive general ledger.
-   * @param   {number} tenantId -
-   * @param   {IPaymentReceive} paymentReceive -
-   * @param   {string} baseCurrencyCode -
-   * @param   {Knex.Transaction} trx -
+   * @param {number} tenantId -
+   * @param {IPaymentReceive} paymentReceive -
+   * @param {string} baseCurrencyCode -
+   * @param {Knex.Transaction} trx -
    * @returns {Ledger}
    */
   public getPaymentReceiveGLedger = async (
@@ -126,100 +107,9 @@ export class PaymentReceiveGLEntries {
     return new Ledger(ledgerEntries);
   };
 
-  /**
-   * Calculates the payment total exchange gain/loss.
-   * @param   {IBillPayment} paymentReceive - Payment receive with entries.
-   * @returns {number}
-   */
-  private getPaymentExGainOrLoss = (
-    paymentReceive: IPaymentReceive
-  ): number => {
-    return sumBy(paymentReceive.entries, (entry) => {
-      const paymentLocalAmount =
-        entry.paymentAmount * paymentReceive.exchangeRate;
-      const invoicePayment = entry.paymentAmount * entry.invoice.exchangeRate;
-
-      return paymentLocalAmount - invoicePayment;
-    });
-  };
-
-  /**
-   * Retrieves the common entry of payment receive.
-   * @param   {IPaymentReceive} paymentReceive
-   * @returns {}
-   */
-  private getPaymentReceiveCommonEntry = (
-    paymentReceive: IPaymentReceive
-  ): IPaymentReceiveGLCommonEntry => {
-    return {
-      debit: 0,
-      credit: 0,
-
-      currencyCode: paymentReceive.currencyCode,
-      exchangeRate: paymentReceive.exchangeRate,
-
-      transactionId: paymentReceive.id,
-      transactionType: 'PaymentReceive',
-
-      transactionNumber: paymentReceive.paymentReceiveNo,
-      referenceNumber: paymentReceive.referenceNo,
-
-      date: paymentReceive.paymentDate,
-      userId: paymentReceive.userId,
-      createdAt: paymentReceive.createdAt,
-
-      branchId: paymentReceive.branchId,
-    };
-  };
-
-  /**
-   * Retrieves the payment exchange gain/loss entry.
-   * @param   {IPaymentReceive} paymentReceive -
-   * @param   {number} ARAccountId -
-   * @param   {number} exchangeGainOrLossAccountId -
-   * @param   {string} baseCurrencyCode -
-   * @returns {ILedgerEntry[]}
-   */
-  private getPaymentExchangeGainLossEntry = (
-    paymentReceive: IPaymentReceive,
-    ARAccountId: number,
-    exchangeGainOrLossAccountId: number,
-    baseCurrencyCode: string
-  ): ILedgerEntry[] => {
-    const commonJournal = this.getPaymentReceiveCommonEntry(paymentReceive);
-    const gainOrLoss = this.getPaymentExGainOrLoss(paymentReceive);
-    const absGainOrLoss = Math.abs(gainOrLoss);
-
-    return gainOrLoss
-      ? [
-          {
-            ...commonJournal,
-            currencyCode: baseCurrencyCode,
-            exchangeRate: 1,
-            debit: gainOrLoss > 0 ? absGainOrLoss : 0,
-            credit: gainOrLoss < 0 ? absGainOrLoss : 0,
-            accountId: ARAccountId,
-            contactId: paymentReceive.customerId,
-            index: 3,
-            accountNormal: AccountNormal.CREDIT,
-          },
-          {
-            ...commonJournal,
-            currencyCode: baseCurrencyCode,
-            exchangeRate: 1,
-            credit: gainOrLoss > 0 ? absGainOrLoss : 0,
-            debit: gainOrLoss < 0 ? absGainOrLoss : 0,
-            accountId: exchangeGainOrLossAccountId,
-            index: 3,
-            accountNormal: AccountNormal.DEBIT,
-          },
-        ]
-      : [];
-  };
-
   /**
    * Retrieves the payment deposit GL entry.
-   * @param   {IPaymentReceive} paymentReceive
+   * @param {IPaymentReceive} paymentReceive
    * @returns {ILedgerEntry}
    */
   private getPaymentDepositGLEntry = (
@@ -238,8 +128,8 @@ export class PaymentReceiveGLEntries {
 
   /**
    * Retrieves the payment receivable entry.
-   * @param   {IPaymentReceive} paymentReceive
-   * @param   {number} ARAccountId
+   * @param {IPaymentReceive} paymentReceive
+   * @param {number} ARAccountId
    * @returns {ILedgerEntry}
    */
   private getPaymentReceivableEntry = (
@@ -262,15 +152,15 @@ export class PaymentReceiveGLEntries {
    * Records payment receive journal transactions.
    *
    * Invoice payment journals.
-   * --------
-   * - Account receivable -> Debit
-   * - Payment account [current asset] -> Credit
+   * ------------
+   * - Account Receivable -> Debit
+   * - Payment Account [current asset] -> Credit
    *
-   * @param   {number} tenantId
-   * @param   {IPaymentReceive} paymentRecieve - Payment receive model.
-   * @param   {number} ARAccountId - A/R account id.
-   * @param   {number} exGainOrLossAccountId - Exchange gain/loss account id.
-   * @param   {string} baseCurrency - Base currency code.
+   * @param {number} tenantId
+   * @param {IPaymentReceive} paymentRecieve - Payment receive model.
+   * @param {number} ARAccountId - A/R account id.
+   * @param {number} exGainOrLossAccountId - Exchange gain/loss account id.
+   * @param {string} baseCurrency - Base currency code.
    * @returns {Promise<ILedgerEntry>}
    */
   public getPaymentReceiveGLEntries = (

packages/server/src/services/Sales/PaymentReceives/PaymentReceivedGLCommon.ts

@@ -0,0 +1,123 @@
+import { sumBy } from 'lodash';
+import {
+  AccountNormal,
+  ILedgerEntry,
+  IPaymentReceive,
+  IPaymentReceiveGLCommonEntry,
+} from '@/interfaces';
+import { Knex } from 'knex';
+import LedgerStorageService from '@/services/Accounting/LedgerStorageService';
+
+export class PaymentReceivedGLCommon {
+  private ledgerStorage: LedgerStorageService;
+
+  /**
+   * Retrieves the common entry of payment receive.
+   * @param {IPaymentReceive} paymentReceive
+   * @returns {IPaymentReceiveGLCommonEntry}
+   */
+  protected getPaymentReceiveCommonEntry = (
+    paymentReceive: IPaymentReceive
+  ): IPaymentReceiveGLCommonEntry => {
+    return {
+      debit: 0,
+      credit: 0,
+
+      currencyCode: paymentReceive.currencyCode,
+      exchangeRate: paymentReceive.exchangeRate,
+
+      transactionId: paymentReceive.id,
+      transactionType: 'PaymentReceive',
+
+      transactionNumber: paymentReceive.paymentReceiveNo,
+      referenceNumber: paymentReceive.referenceNo,
+
+      date: paymentReceive.paymentDate,
+      userId: paymentReceive.userId,
+      createdAt: paymentReceive.createdAt,
+
+      branchId: paymentReceive.branchId,
+    };
+  };
+
+  /**
+   * Retrieves the payment exchange gain/loss entry.
+   * @param   {IPaymentReceive} paymentReceive -
+   * @param   {number} ARAccountId -
+   * @param   {number} exchangeGainOrLossAccountId -
+   * @param   {string} baseCurrencyCode -
+   * @returns {ILedgerEntry[]}
+   */
+  protected getPaymentExchangeGainLossEntry = (
+    paymentReceive: IPaymentReceive,
+    ARAccountId: number,
+    exchangeGainOrLossAccountId: number,
+    baseCurrencyCode: string
+  ): ILedgerEntry[] => {
+    const commonJournal = this.getPaymentReceiveCommonEntry(paymentReceive);
+    const gainOrLoss = this.getPaymentExGainOrLoss(paymentReceive);
+    const absGainOrLoss = Math.abs(gainOrLoss);
+
+    return gainOrLoss
+      ? [
+          {
+            ...commonJournal,
+            currencyCode: baseCurrencyCode,
+            exchangeRate: 1,
+            debit: gainOrLoss > 0 ? absGainOrLoss : 0,
+            credit: gainOrLoss < 0 ? absGainOrLoss : 0,
+            accountId: ARAccountId,
+            contactId: paymentReceive.customerId,
+            index: 3,
+            accountNormal: AccountNormal.CREDIT,
+          },
+          {
+            ...commonJournal,
+            currencyCode: baseCurrencyCode,
+            exchangeRate: 1,
+            credit: gainOrLoss > 0 ? absGainOrLoss : 0,
+            debit: gainOrLoss < 0 ? absGainOrLoss : 0,
+            accountId: exchangeGainOrLossAccountId,
+            index: 3,
+            accountNormal: AccountNormal.DEBIT,
+          },
+        ]
+      : [];
+  };
+
+  /**
+   * Calculates the payment total exchange gain/loss.
+   * @param {IBillPayment} paymentReceive - Payment receive with entries.
+   * @returns {number}
+   */
+  private getPaymentExGainOrLoss = (
+    paymentReceive: IPaymentReceive
+  ): number => {
+    return sumBy(paymentReceive.entries, (entry) => {
+      const paymentLocalAmount =
+        entry.paymentAmount * paymentReceive.exchangeRate;
+      const invoicePayment = entry.paymentAmount * entry.invoice.exchangeRate;
+
+      return paymentLocalAmount - invoicePayment;
+    });
+  };
+
+  /**
+   * Reverts the given payment receive GL entries.
+   * @param {number} tenantId
+   * @param {number} paymentReceiveId
+   * @param {Knex.Transaction} trx
+   */
+  public revertPaymentGLEntries = async (
+    tenantId: number,
+    paymentReceiveId: number,
+    trx?: Knex.Transaction
+  ) => {
+    await this.ledgerStorage.deleteByReference(
+      tenantId,
+      paymentReceiveId,
+      'PaymentReceive',
+      trx
+    );
+  };
+}

packages/server/src/services/Sales/PaymentReceives/PaymentReceivedUnearnedGLEntries.ts

@@ -0,0 +1,110 @@
+import * as R from 'ramda';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+import { TenantMetadata } from '@/system/models';
+import { Knex } from 'knex';
+import { Inject, Service } from 'typedi';
+import { PaymentReceivedGLCommon } from './PaymentReceivedGLCommon';
+import {
+  AccountNormal,
+  ILedgerEntry,
+  IPaymentReceive,
+  IPaymentReceiveEntry,
+} from '@/interfaces';
+
+@Service()
+export class PaymentReceivedUnearnedGLEntries extends PaymentReceivedGLCommon {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  /**
+   * Writes payment GL entries to the storage.
+   * @param {number} tenantId
+   * @param {number} paymentReceiveId
+   * @param {Knex.Transaction} trx
+   * @returns {Promise<void>}
+   */
+  public writePaymentGLEntries = async (
+    tenantId: number,
+    paymentReceiveId: number,
+    trx?: Knex.Transaction
+  ): Promise<void> => {
+    const { PaymentReceive } = this.tenancy.models(tenantId);
+
+    // Retrieves the given tenant metadata.
+    const tenantMeta = await TenantMetadata.query().findOne({ tenantId });
+
+    // Retrieves the payment receive with associated entries.
+    const paymentReceive = await PaymentReceive.query(trx)
+      .findById(paymentReceiveId)
+      .withGraphFetched('entries.invoice');
+
+    if (paymentReceive.unearnedRevenueAccountId) {
+      return;
+    }
+    
+  };
+
+  private getPaymentGLEntries = (paymentReceive: IPaymentReceive) => {};
+
+  private getPaymentUnearnedGLEntries = R.curry(() => {});
+
+  /**
+   *
+   * @param {IPaymentReceiveEntry} paymentReceivedEntry -
+   * @param {IPaymentReceive} paymentReceive -
+   */
+  private getPaymentEntryGLEntries = R.curry(
+    (
+      paymentReceivedEntry: IPaymentReceiveEntry,
+      paymentReceive: IPaymentReceive
+    ) => {
+      const depositEntry = this.getPaymentDepositGLEntry(
+        paymentReceivedEntry.paymentAmount,
+        paymentReceive
+      );
+    }
+  );
+
+  /**
+   * Retrieves the payment deposit GL entry.
+   * @param {IPaymentReceive} paymentReceive
+   * @returns {ILedgerEntry}
+   */
+  private getPaymentDepositGLEntry = (
+    amount: number,
+    paymentReceive: IPaymentReceive
+  ): ILedgerEntry => {
+    const commonJournal = this.getPaymentReceiveCommonEntry(paymentReceive);
+
+    return {
+      ...commonJournal,
+      credit: amount,
+      accountId: paymentReceive.unearnedRevenueAccountId,
+      accountNormal: AccountNormal.CREDIT,
+      index: 2,
+    };
+  };
+
+  /**
+   * Retrieves the payment receivable entry.
+   * @param {IPaymentReceive} paymentReceive
+   * @param {number} ARAccountId
+   * @returns {ILedgerEntry}
+   */
+  private getPaymentReceivableEntry = (
+    amount: number,
+    paymentReceive: IPaymentReceive,
+    ARAccountId: number
+  ): ILedgerEntry => {
+    const commonJournal = this.getPaymentReceiveCommonEntry(paymentReceive);
+
+    return {
+      ...commonJournal,
+      debit: amount,
+      contactId: paymentReceive.customerId,
+      accountId: ARAccountId,
+      accountNormal: AccountNormal.DEBIT,
+      index: 1,
+    };
+  };
+}

packages/server/src/services/Sales/PaymentReceives/events/AutoApplyUnearnedRevenueOnInvoiceCreated.ts

@@ -0,0 +1,34 @@
+import { Inject, Service } from 'typedi';
+import events from '@/subscribers/events';
+import { AutoApplyUnearnedRevenue } from '../AutoApplyUnearnedRevenue';
+
+@Service()
+export class AutoApplyUnearnedRevenueOnInvoiceCreated {
+  @Inject()
+  private autoApplyUnearnedRevenue: AutoApplyUnearnedRevenue;
+  /**
+   * Constructor method.
+   */
+  public attach(bus) {
+    bus.subscribe(
+      events.saleInvoice.onCreated,
+      this.handleAutoApplyUnearnedRevenueOnInvoiceCreated.bind(this)
+    );
+  }
+
+  /**
+   * Handles the auto apply unearned revenue on invoice creating.
+   * @param 
+   */
+  private async handleAutoApplyUnearnedRevenueOnInvoiceCreated({
+    tenantId,
+    saleInvoice,
+    trx,
+  }) {
+    await this.autoApplyUnearnedRevenue.autoApplyUnearnedRevenueToInvoice(
+      tenantId,
+      saleInvoice.id,
+      trx
+    );
+  }
+}

packages/webapp/src/containers/Sales/PaymentReceives/PaymentReceiveForm/PaymentReceiveForm.tsx

@@ -102,17 +102,6 @@ function PaymentReceiveForm({
   ) => {
     setSubmitting(true);
 
-    // Calculates the total payment amount of entries.
-    const totalPaymentAmount = sumBy(values.entries, 'payment_amount');
-
-    if (totalPaymentAmount <= 0) {
-      AppToaster.show({
-        message: intl.get('you_cannot_make_payment_with_zero_total_amount'),
-        intent: Intent.DANGER,
-      });
-      setSubmitting(false);
-      return;
-    }
     // Transformes the form values to request body.
     const form = transformFormToRequest(values);
 

packages/webapp/src/containers/Sales/PaymentReceives/PaymentReceiveForm/PaymentReceiveHeaderFields.tsx

@@ -124,7 +124,7 @@ export default function PaymentReceiveHeaderFields() {
       </FastField>
 
       {/* ------------ Full amount ------------ */}
-      <Field name={'full_amount'}>
+      <Field name={'amount'}>
         {({
           form: {
             setFieldValue,
@@ -146,7 +146,7 @@ export default function PaymentReceiveHeaderFields() {
               <MoneyInputGroup
                 value={value}
                 onChange={(value) => {
-                  setFieldValue('full_amount', value);
+                  setFieldValue('amount', value);
                 }}
                 onBlurValue={onFullAmountBlur}
               />

packages/webapp/src/containers/Sales/PaymentReceives/PaymentReceiveForm/utils.tsx

@@ -42,7 +42,7 @@ export const defaultPaymentReceive = {
   // Holds the payment number that entered manually only.
   payment_receive_no_manually: '',
   statement: '',
-  full_amount: '',
+  amount: '',
   currency_code: '',
   branch_id: '',
   exchange_rate: 1,