protected function getCurrentItemId(DeliveryExecution $deliveryExecution)
    {
        $result = null;
        $session = $this->getTestSessionService()->getTestSession($deliveryExecution);
        if ($session) {
            $item = $session->getCurrentAssessmentItemRef();
            if ($item) {
                $result = $item->getIdentifier();
            }
        }
        return $result;
    }