fix: Invalid bill payment amount on editing bill payment

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

@@ -21,6 +21,20 @@ export class BillsValidators {
     }
   }
 
+  /**
+   * Validates the bill amount is bigger than paid amount.
+   * @param {number} billAmount 
+   * @param {number} paidAmount 
+   */
+  public validateBillAmountBiggerPaidAmount(
+    billAmount: number,
+    paidAmount: number,
+  ) {
+    if (billAmount < paidAmount) {
+      throw new ServiceError(ERRORS.BILL_AMOUNT_SMALLER_THAN_PAID_AMOUNT);
+    }
+  }
+
   /**
    * Validates the bill number existance.
    */

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

@@ -103,6 +103,7 @@ export class EditBill {
       tenantId,
       billDTO.entries
     );
+    
     // Transforms the bill DTO to model object.
     const billObj = await this.transformerDTO.billDTOToModel(
       tenantId,
@@ -111,6 +112,11 @@ export class EditBill {
       authorizedUser,
       oldBill
     );
+    // Validate bill total amount should be bigger than paid amount.
+    this.validators.validateBillAmountBiggerPaidAmount(
+      billObj.amount,
+      oldBill.paymentAmount
+    );
     // Validate landed cost entries that have allocated cost could not be deleted.
     await this.entriesService.validateLandedCostEntriesNotDeleted(
       oldBill.entries,

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

@@ -18,6 +18,7 @@ export const ERRORS = {
   LANDED_COST_ENTRIES_SHOULD_BE_INVENTORY_ITEMS:
     'LANDED_COST_ENTRIES_SHOULD_BE_INVENTORY_ITEMS',
   BILL_HAS_APPLIED_TO_VENDOR_CREDIT: 'BILL_HAS_APPLIED_TO_VENDOR_CREDIT',
+  BILL_AMOUNT_SMALLER_THAN_PAID_AMOUNT: 'BILL_AMOUNT_SMALLER_THAN_PAID_AMOUNT',
 };
 
 export const DEFAULT_VIEW_COLUMNS = [];