From fdef484415c548ceca9f4025ad6d19c655e82784 Mon Sep 17 00:00:00 2001
From: Rutvik Monpara <rutvikmonpara3012@gmail.com>
Date: Thu, 1 Jan 2026 12:28:18 +0530
Subject: [PATCH] Wrong backorder qty issue fixed when same product added
 multiple times with different custom options

---
 InventorySales/Model/GetBackorder.php               | 12 ++++++++++++
 .../BackOrderNotifyCustomerCondition.php            | 13 +++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/InventorySales/Model/GetBackorder.php b/InventorySales/Model/GetBackorder.php
index 0573a718801..72376c25e05 100644
--- a/InventorySales/Model/GetBackorder.php
+++ b/InventorySales/Model/GetBackorder.php
@@ -75,6 +75,13 @@ class GetBackorder
      */
     private $getBackorderQty;
 
+    /**
+     * Product backorder qty's checked
+     *
+     * @var array
+     */
+    private $backorderQty = [];
+
     /**
      * @param ObjectFactory $objectFactory
      * @param FormatInterface $format
@@ -161,6 +168,11 @@ public function execute(int $productId, $itemQty, $qtyToCheck, $scopeId): object
                 }
             }
             $backorderQty = $this->getBackorderQty->execute($productSku, (int)$stockId, $qty);
+            if (isset($this->backorderQty[$productSku])) {
+                $backorderQty -= $this->backorderQty[$productSku];
+            } else {
+                $this->backorderQty[$productSku] = $backorderQty;
+            }
             if ($backorderQty > 0) {
                 $result->setItemBackorders($backorderQty);
             }
diff --git a/InventorySales/Model/IsProductSalableCondition/BackOrderNotifyCustomerCondition.php b/InventorySales/Model/IsProductSalableCondition/BackOrderNotifyCustomerCondition.php
index 2c54a36bbf4..a00cb2d61cc 100644
--- a/InventorySales/Model/IsProductSalableCondition/BackOrderNotifyCustomerCondition.php
+++ b/InventorySales/Model/IsProductSalableCondition/BackOrderNotifyCustomerCondition.php
@@ -45,6 +45,13 @@ class BackOrderNotifyCustomerCondition implements IsProductSalableForRequestedQt
      */
     private $getBackorderQty;
 
+    /**
+     * Product backorder qty's checked
+     *
+     * @var array
+     */
+    private $backorderQty = [];
+
     /**
      * @param GetStockItemConfigurationInterface $getStockItemConfiguration
      * @param GetStockItemDataInterface $getStockItemData @deprecated
@@ -81,6 +88,12 @@ public function execute(string $sku, int $stockId, float $requestedQty): Product
         ) {
             $backorderQty = $this->getBackorderQty->execute($sku, $stockId, $requestedQty);
 
+            if (isset($this->backorderQty[$sku])) {
+                $backorderQty -= $this->backorderQty[$sku];
+            } else {
+                $this->backorderQty[$sku] = $backorderQty;
+            }
+
             if ($backorderQty > 0) {
                 $errors = [
                     $this->productSalabilityErrorFactory->create([