Get supplier organization from order item

backend/app/plugins/wiaas/includes/delivery-process/class-wiaas-delivery-process-step-assignee.php

@@ -100,10 +100,7 @@ class Wiaas_Delivery_Process_Step_Assignee {
 
 				$item = $order->get_item($item_id);
 
-				$product_id = $item['product_id'];
-
-				//TODO: Get this value from order since product can get changed or deleted later
-				$organization_id = Wiaas_Product_Supplier::get_supplier_organisation_id_from_product($product_id);
+				$organization_id = $item['wiaas_supplier_organization_id'];
 
 				$user_ids = wiaas_get_organization_user_ids($organization_id);