/**
  * get the activty status IDs that are considered to be live and fixable
  * 
  * @return string  comma separated ids
  */
 public static function getFixableActivityStatusIDs()
 {
     if (self::$fixable_activity_status_ids === NULL) {
         $status_ids = array();
         $status_ids[] = CRM_Core_OptionGroup::getValue('activity_status', 'Scheduled', 'name');
         self::$fixable_activity_status_ids = implode(',', $status_ids);
     }
     return self::$fixable_activity_status_ids;
 }