feat: add local discount and adjustment calculations to financial models and transformers

- Introduced `discountAmountLocal` and `adjustmentLocal` properties across Bill, CreditNote, SaleInvoice, SaleReceipt, and VendorCredit models to calculate amounts in local currency.
- Updated transformers for CreditNote, PurchaseInvoice, and VendorCredit to include formatted representations of local discount and adjustment amounts.
- Enhanced GL entry services to handle discount and adjustment entries for SaleReceipt and CreditNote, ensuring accurate ledger entries.
- Improved overall consistency in handling financial calculations across various models and services.

packages/server/src/models/SaleInvoice.ts

@@ -73,12 +73,14 @@ export default class SaleInvoice extends mixin(TenantModel, [
 
       'taxAmountWithheldLocal',
       'discountAmount',
+      'discountAmountLocal',
       'discountPercentage',
 
       'total',
       'totalLocal',
 
       'writtenoffAmountLocal',
+      'adjustmentLocal',
     ];
   }
 
@@ -143,6 +145,14 @@ export default class SaleInvoice extends mixin(TenantModel, [
       : this.subtotal * (this.discount / 100);
   }
 
+  /**
+   * Local discount amount.
+   * @returns {number | null}
+   */
+  get discountAmountLocal() {
+    return this.discountAmount ? this.discountAmount * this.exchangeRate : null;
+  }
+
   /**
    * Discount percentage.
    * @returns {number | null}
@@ -151,6 +161,14 @@ export default class SaleInvoice extends mixin(TenantModel, [
     return this.discountType === DiscountType.Percentage ? this.discount : null;
   }
 
+  /**
+   * Adjustment amount in local currency.
+   * @returns {number | null}
+   */
+  get adjustmentLocal(): number | null {
+    return this.adjustment ? this.adjustment * this.exchangeRate : null;
+  }
+
   /**
    * Invoice total. (Tax included)
    * @returns {number}