/**
  *   remove_registration
  *
  * @access protected
  * @param EE_Transaction $transaction
  * @param EE_Registration $registration
  * @return bool
  */
 protected static function remove_registration(EE_Transaction $transaction, EE_Registration $registration)
 {
     if ($registration instanceof EE_Registration) {
         $transaction->_remove_relation_to($registration, 'Registration');
         $registration->delete();
         return true;
     }
     return false;
 }