// Remove $display_multishop_toolbar and add instead $multishop_context to manage shop context per admin controller

controllers/admin/AdminStockManagementController.php

@@ -36,7 +36,6 @@ class AdminStockManagementControllerCore extends AdminController
 		$this->table = 'product';
 		$this->className = 'Product';
 		$this->lang = true;
-		$this->display_multishop_toolbar = false;
 
 		$this->fieldsDisplay = array(
 			'reference' => array(
@@ -72,6 +71,8 @@ class AdminStockManagementControllerCore extends AdminController
 
 		parent::__construct();
 
+		$this->multishop_context = null;
+
 		// overrides confirmation messages specifically for this controller
 		$this->_conf = array(
 			1 => $this->l('The product was successfully added to stock'),