From 3bf73e388a88e41d9b32858f5c6e5964b563d99d Mon Sep 17 00:00:00 2001
From: pepijn-vanvlaanderen <pepijn@webbers.com>
Date: Wed, 15 Mar 2023 16:07:24 +0100
Subject: [PATCH] Fix issue on fixed total amount discount when using includes
 tax (#3472)

The calculation of the fixed discount amount breaks when having includes_tax setting active, due to the line item totals are incorrect and returning everything as 0, thus the totalItemPercentage will be Infinitiy due to the division by a subtotal of 0
---
 packages/medusa/src/services/discount.ts | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/packages/medusa/src/services/discount.ts b/packages/medusa/src/services/discount.ts
index c4b55f53eb..c6c1805344 100644
--- a/packages/medusa/src/services/discount.ts
+++ b/packages/medusa/src/services/discount.ts
@@ -634,12 +634,9 @@ class DiscountService extends TransactionBaseService {
         })
 
       let fullItemPrice = lineItem.unit_price * lineItem.quantity
-      if (
-        this.featureFlagRouter_.isFeatureEnabled(
-          TaxInclusivePricingFeatureFlag.key
-        ) &&
-        lineItem.includes_tax
-      ) {
+      const includesTax = this.featureFlagRouter_.isFeatureEnabled(TaxInclusivePricingFeatureFlag.key) && lineItem.includes_tax
+
+      if (includesTax) {
         const lineItemTotals = await this.newTotalsService_
           .withTransaction(transactionManager)
           .getLineItemTotals([lineItem], {
@@ -664,6 +661,7 @@ class DiscountService extends TransactionBaseService {
         const totals = await this.newTotalsService_.getLineItemTotals(
           discountedItems,
           {
+            includeTax: includesTax,
             calculationContext,
           }
         )