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README.md

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+# POS Loyalty Discount Before Tax
+
+This module modifies the loyalty reward discount calculation in POS to apply discounts before tax calculation and ensures that discount values are displayed as tax-exclusive in both the POS receipt and accounting entries.
+
+## Features
+
+1. **Discount Calculation Before Tax**: All loyalty rewards are calculated on the tax-exclusive amount rather than the tax-inclusive amount.
+
+2. **Tax-Exclusive Display**: Discount values are displayed as tax-exclusive in the POS receipt.
+
+3. **Proper Accounting Entries**: Accounting entries are created with tax only on the credit side, ensuring compliance with accounting standards.
+
+## Technical Changes
+
+### JavaScript Changes
+
+- Modified `static/src/overrides/models/loyalty.js` to calculate discounts on tax-exclusive amounts
+- Ensured discount line values are tax-exclusive for display purposes
+
+### Backend Changes
+
+- Created `models/pos_order.py` to handle accounting entries for loyalty discounts
+- Created `models/loyalty_reward.py` to ensure discount products are properly configured
+- Created `models/account_move.py` to ensure discount lines in account moves are tax-exclusive
+- Created `models/pos_session.py` to handle session-level accounting for loyalty discounts
+
+## Installation
+
+1. Copy the module to your Odoo addons directory
+2. Update the apps list in Odoo
+3. Install the "POS Loyalty Discount Before Tax" module
+
+## Configuration
+
+No additional configuration is required. The module automatically applies the changes to all loyalty programs in POS.
+
+## Usage
+
+The module works automatically with all existing loyalty programs. Discounts will be calculated on tax-exclusive amounts and displayed as such in the POS interface and accounting entries.
+
+## Compatibility
+
+This module is compatible with Odoo 17 and requires the following modules:
+- point_of_sale
+- pos_loyalty
+
+## License
+
+LGPL-3

__init__.py

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+# -*- coding: utf-8 -*-

__manifest__.py

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+{
+    "name": "POS Loyalty Discount Before Tax",
+    "version": "1.6",
+    "category": "Point of Sale",
+    "summary": "Modify loyalty reward discount calculation to apply before tax in POS",
+    "author": "Suherdy Yacob",
+    "description": """
+        This module modifies the loyalty reward discount calculation in POS to apply discounts before tax calculation.
+    """,
+    "depends": ["point_of_sale", "pos_loyalty"],
+    "data": [
+        
+    ],
+    "assets": {
+        "point_of_sale._assets_pos": [
+            'pos_loyalty_discount_before_tax/static/src/overrides/models/loyalty.js',
+        ]
+    },
+    "installable": True,
+    "auto_install": False,
+    "license": "LGPL-3"
+}

static/src/overrides/models/loyalty.js

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+/** @odoo-module **/
+
+import { Order } from "@point_of_sale/app/store/models";
+import { patch } from "@web/core/utils/patch";
+import { roundPrecision } from "@web/core/utils/numbers";
+
+// Patch Order methods to handle all loyalty discounts with discount_before_tax
+patch(Order.prototype, {
+    /**
+     * Override to calculate discountable amount without tax for all reward types
+     */
+    _getDiscountableOnOrder(reward) {
+        // For all rewards, we calculate discounts without tax
+        let discountable = 0;
+        const discountablePerTax = {};
+        const orderLines = this.get_orderlines();
+
+        for (const line of orderLines) {
+            if (!line.get_quantity()) {
+                continue;
+            }
+
+            // Skip reward lines to avoid circular discounts (unless specifically allowed)
+            if (line.reward_id || line.is_reward_line) {
+                continue;
+            }
+
+            // Use price without tax for discount calculation
+            const line_total_without_tax = line.get_price_without_tax();
+
+            const taxKey = ['ewallet', 'gift_card'].includes(reward.program_id.program_type)
+                ? line.get_taxes().map((t) => t.id)
+                : line.get_taxes().filter((t) => t.amount_type !== 'fixed').map((t) => t.id);
+
+            discountable += line_total_without_tax;
+            if (!discountablePerTax[taxKey]) {
+                discountablePerTax[taxKey] = 0;
+            }
+            discountablePerTax[taxKey] += line_total_without_tax;
+        }
+        return { discountable, discountablePerTax };
+    },
+
+    /**
+     * Override to calculate cheapest line discountable without tax for all reward types
+     */
+    _getDiscountableOnCheapest(reward) {
+        // For all rewards, we calculate discounts without tax
+        const cheapestLine = this._getCheapestLine();
+        if (!cheapestLine) {
+            return { discountable: 0, discountablePerTax: {} };
+        }
+
+        // Use price without tax for discount calculation
+        const discountableWithoutTax = cheapestLine.get_price_without_tax();
+        const taxKey = cheapestLine.get_taxes().map((t) => t.id);
+
+        return {
+            discountable: discountableWithoutTax,
+            discountablePerTax: Object.fromEntries([[taxKey, discountableWithoutTax]]),
+        };
+    },
+
+    /**
+     * Override to calculate specific product discountable without tax for all reward types
+     */
+    _getDiscountableOnSpecific(reward) {
+        // For all rewards, we calculate discounts without tax
+        const applicableProducts = reward.all_discount_product_ids;
+        const linesToDiscount = [];
+        const discountLinesPerReward = {};
+        const orderLines = this.get_orderlines();
+        const remainingAmountPerLine = {};
+
+        for (const line of orderLines) {
+            if (!line.get_quantity() || !line.price) {
+                continue;
+            }
+            const product_id = line.get_product().id;
+            remainingAmountPerLine[line.cid] = line.get_price_without_tax();
+
+            let included = false;
+
+            if (
+                applicableProducts.has(product_id) ||
+                (line.reward_product_id && applicableProducts.has(line.reward_product_id))
+            ) {
+                linesToDiscount.push(line);
+                included = true;
+            } else if (line.reward_id) {
+                const lineReward = this.pos.reward_by_id[line.reward_id];
+                if (lineReward.id === reward.id ||
+                    (
+                        orderLines.some(product =>
+                            lineReward.all_discount_product_ids.has(product.get_product().id) &&
+                            applicableProducts.has(product.get_product().id)
+                        ) &&
+                        lineReward.reward_type === 'discount' &&
+                        lineReward.discount_mode != 'percent'
+                    )
+                ) {
+                    linesToDiscount.push(line);
+                    included = true;
+                }
+                if (!discountLinesPerReward[line.reward_identifier_code]) {
+                    discountLinesPerReward[line.reward_identifier_code] = [];
+                }
+                discountLinesPerReward[line.reward_identifier_code].push(line);
+            }
+        }
+
+        let discountable = 0;
+        const discountablePerTax = {};
+        for (const line of linesToDiscount) {
+            discountable += remainingAmountPerLine[line.cid];
+            const taxKey = line.get_taxes().map((t) => t.id);
+            if (!discountablePerTax[taxKey]) {
+                discountablePerTax[taxKey] = 0;
+            }
+            discountablePerTax[taxKey] +=
+                remainingAmountPerLine[line.cid];
+        }
+        return { discountable, discountablePerTax };
+    },
+
+    /**
+     * Override reward line values creation to handle discount calculation without tax for all rewards
+     */
+    _getRewardLineValuesDiscount(args) {
+        const reward = args["reward"];
+        const coupon_id = args["coupon_id"];
+
+        // For all rewards, we calculate discounts without tax
+        const rewardAppliesTo = reward.discount_applicability;
+
+        let getDiscountable;
+        if (rewardAppliesTo === "order") {
+            getDiscountable = this._getDiscountableOnOrder.bind(this);
+        } else if (rewardAppliesTo === "cheapest") {
+            getDiscountable = this._getDiscountableOnCheapest.bind(this);
+        } else if (rewardAppliesTo === "specific") {
+            getDiscountable = this._getDiscountableOnSpecific.bind(this);
+        }
+        if (!getDiscountable) {
+            return "Unknown discount type";
+        }
+
+        let { discountable, discountablePerTax } = getDiscountable(reward);
+        // For all rewards, we should use total without tax for comparison
+        const totalForComparison = this.get_total_without_tax();
+        discountable = Math.min(totalForComparison, discountable);
+        if (!discountable) {
+            return [];
+        }
+
+        let maxDiscount = reward.discount_max_amount || Infinity;
+        if (reward.discount_mode === "per_point") {
+            const points = (["ewallet", "gift_card"].includes(reward.program_id.program_type)) ?
+                this._getRealCouponPoints(coupon_id) :
+                Math.floor(this._getRealCouponPoints(coupon_id) / reward.required_points) * reward.required_points;
+            maxDiscount = Math.min(
+                maxDiscount,
+                roundPrecision(reward.discount * points, this.pos.currency.rounding)
+            );
+        } else if (reward.discount_mode === "per_order") {
+            maxDiscount = Math.min(maxDiscount, reward.discount);
+        } else if (reward.discount_mode === "percent") {
+            maxDiscount = Math.min(maxDiscount, roundPrecision(discountable * (reward.discount / 100), this.pos.currency.rounding));
+        }
+
+        const rewardCode = Math.random().toString(36).substring(3);
+        let pointCost = reward.clear_wallet
+            ? this._getRealCouponPoints(coupon_id)
+            : reward.required_points;
+
+        if (reward.discount_mode === "per_point" && !reward.clear_wallet) {
+            pointCost = roundPrecision(Math.min(maxDiscount, discountable) / reward.discount, this.pos.currency.rounding);
+        }
+
+        // Apply rounding to pointCost if it's calculated from division
+        if (pointCost && typeof pointCost === 'number') {
+            pointCost = roundPrecision(pointCost, this.pos.currency.rounding);
+        }
+
+        // For all rewards, we calculate discount on price without tax
+        // Calculate the total discountable amount without tax
+        let totalDiscountableWithoutTax = 0;
+        for (const [, amount] of Object.entries(discountablePerTax)) {
+            totalDiscountableWithoutTax += amount;
+        }
+
+        const discountFactor = totalDiscountableWithoutTax ? Math.min(1, maxDiscount / totalDiscountableWithoutTax) : 1;
+
+        const result = Object.entries(discountablePerTax).reduce((lst, entry) => {
+            if (!entry[1]) {
+                return lst;
+            }
+            const taxIds = entry[0] === "" ? [] : entry[0].split(",").map((str) => parseInt(str));
+            // Calculate tax-exclusive discount value for display
+            const preliminaryAmount = entry[1] * discountFactor;
+            const discountAmount = roundPrecision(preliminaryAmount, this.pos.currency.rounding);
+            lst.push({
+                product: reward.discount_line_product_id,
+                price: -discountAmount,
+                quantity: 1,
+                reward_id: reward.id,
+                is_reward_line: true,
+                coupon_id: coupon_id,
+                points_cost: 0,
+                reward_identifier_code: rewardCode,
+                tax_ids: taxIds,
+                merge: false,
+            });
+            return lst;
+        }, []);
+
+        if (result.length) {
+            result[0]["points_cost"] = pointCost;
+        }
+        return result;
+    }
+});