From b2551f883b00179fc935e941083aadba0522752c Mon Sep 17 00:00:00 2001
From: Dhiraj Maurya <mauryadheeraj226@gmail.com>
Date: Thu, 10 Sep 2026 11:50:17 +0000
Subject: [PATCH] fix: sync line.variantId to resolved variant ID to prevent
 inventory lock collision

Signed-off-by: Dhiraj Maurya <mauryadheeraj226@gmail.com>
---
 backend/services/inventoryReservationService.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/services/inventoryReservationService.js b/backend/services/inventoryReservationService.js
index 5a4fda5a..3e51ad17 100644
--- a/backend/services/inventoryReservationService.js
+++ b/backend/services/inventoryReservationService.js
@@ -111,6 +111,9 @@ async function reserveStockInTransaction(conn, userId, productId, quantity, now,
 
     if (variant) {
         totalStock = safeNumber(variant.stock);
+        if(line.variantId <= NO_VARIANT_ID){
+            line.variantId = variant.id;
+        }
     }
 
     const [locks] = variant