Modify attributes only from product attribute set

app/code/community/BL/CustomGrid/Model/Grid/Editor/Product.php

@@ -206,7 +206,15 @@ public function loadEditedProduct($entityId, BL_CustomGrid_Model_Grid_Editor_Con
 
         /** @var Mage_Catalog_Model_Product $product */
         $product = Mage::getModel('catalog/product');
-        $product->setStoreId($storeId)->setData('_edit_mode', true)->load($entityId);
+        $product->setStoreId($storeId)->setData('_edit_mode', true);
+
+        /**
+         * Reset cached attributes in resource singleton and load new from product attributes set
+         */
+        $product->getResource()
+            ->unsetAttributes();
+
+        $product->load($entityId);
 
         return $product;
     }