public function DBInsertNoReload()
 {
     $oMutex = new iTopMutex('ticket_insert');
     $oMutex->Lock();
     $iNextId = MetaModel::GetNextKey(get_class($this));
     $sRef = $this->MakeTicketRef($iNextId);
     $this->Set('ref', $sRef);
     $iKey = parent::DBInsertNoReload();
     $oMutex->Unlock();
     return $iKey;
 }