public function getPurchasedSeparatelySelect()
 {
     $html = parent::getPurchasedSeparatelySelect();
     $role = Mage::getSingleton('aitpermissions/role');
     if (!Mage::app()->isSingleStoreMode() && $role->isPermissionsEnabled() && !$role->canEditGlobalAttributes()) {
         $html = str_replace('<select', '<select disabled="disabled"', $html);
     }
     return $html;
 }