public function discardReservations()
    {
        foreach (array_keys($this->_getReservedItems()) as $sArticleId) {
            $this->discardArticleReservation($sArticleId);
        }
        if ($this->_oReservations) {
            $this->_oReservations->delete();
            $this->_oReservations = null;
            $this->_aCurrentlyReserved = null;
        }
    }