protected function _getReservationsId()
    {
        $sId = \OxidEsales\Eshop\Core\Registry::getSession()->getVariable('basketReservationToken');
        if (!$sId) {
            $utilsObject = $this->getUtilsObjectInstance();
            $sId = $utilsObject->generateUId();
            \OxidEsales\Eshop\Core\Registry::getSession()->setVariable('basketReservationToken', $sId);
        }

        return $sId;
    }