Fixed stock status update from SOAP API V2 (#1635)

Author: elidrissidev

app/code/core/Mage/CatalogInventory/Model/Stock/Item/Api/V2.php

@@ -35,14 +35,15 @@ public function update($productId, $data)
         $idBySku = $product->getIdBySku($productId);
         $productId = $idBySku ? $idBySku : $productId;
 
-        $product->setStoreId($this->_getStoreId())
-            ->load($productId);
+        /** @var Mage_CatalogInventory_Model_Stock_Item $stockItem */
+        $stockItem = Mage::getModel('cataloginventory/stock_item')
+            ->setStoreId($this->_getStoreId())
+            ->loadByProduct($productId);
 
-        if (!$product->getId()) {
+        if (!$stockItem->getId()) {
             $this->_fault('not_exists');
         }
 
-        $stockItem = $product->getStockItem();
         $stockData = array_replace($stockItem->getData(), (array)$data);
         $stockItem->setData($stockData);