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;
}