fix: update Ojol discount calculation to use priceIncl and correctly handle tax inclusion in POS order lines

static/src/overrides/models/orderline.js

@@ -28,7 +28,7 @@ patch(PosOrder.prototype, {
         const base = super.getTotalDiscount();
         const ojolLine = this.lines.find((l) => l.is_ojol_discount);
         if (ojolLine) {
-            return base + Math.abs(ojolLine.price_unit * ojolLine.qty);
+            return base + Math.abs(ojolLine.priceIncl);
         }
         return base;
     },

static/src/overrides/models/pos_order.js

@@ -2,6 +2,7 @@
 
 import { PosOrder } from "@point_of_sale/app/models/pos_order";
 import { patch } from "@web/core/utils/patch";
+import { accountTaxHelpers } from "@account/helpers/account_tax";
 
 patch(PosOrder.prototype, {
     /**
@@ -16,7 +17,7 @@ patch(PosOrder.prototype, {
      */
     getOjolDiscount() {
         const line = this.getOjolDiscountLine();
-        return line ? Math.abs(line.price_unit * line.qty) : 0;
+        return line ? Math.abs(line.priceIncl) : 0;
     },
 
     /**
@@ -52,17 +53,36 @@ patch(PosOrder.prototype, {
             return;
         }
 
+        const taxes = productTmpl.taxes_id || [];
+        const desiredTotal = Math.abs(amount);
+        const company = this.company || this.config.company_id;
+        const taxDetails = accountTaxHelpers.get_tax_details(taxes, desiredTotal, 1.0, {
+            precision_rounding: this.currency.rounding,
+            rounding_method: company?.tax_calculation_rounding_method || "round_per_line",
+            product: productVariant,
+        });
+
+        let sumPriceIncludedTaxes = 0.0;
+        for (const taxData of taxDetails.taxes_data) {
+            if (taxData.tax.price_include) {
+                sumPriceIncludedTaxes += taxData.tax_amount;
+            }
+        }
+        const finalPriceUnit = -(taxDetails.total_excluded + sumPriceIncludedTaxes);
+
         // Create negative-price discount line
         this.models["pos.order.line"].create({
             order_id: this,
             product_id: productVariant,
             product_tmpl_id: productTmpl,
-            price_unit: -Math.abs(amount),
+            price_unit: finalPriceUnit,
             qty: 1,
             discount: 0,
             price_type: "manual",
             full_product_name: "Diskon Ojol",
             is_ojol_discount: true,
+            tax_ids: (productTmpl.taxes_id || []).map((tax) => ["link", tax]),
         });
     },
 });
+