public function getArtStockInBasket($sArtId, $sExpiredArtId = null)
    {
        $dArtStock = 0;
        foreach ($this->_aBasketContents as $sItemKey => $oOrderArticle) {
            if ($oOrderArticle && ($sExpiredArtId == null || $sExpiredArtId != $sItemKey)) {
                if ($oOrderArticle->getArticle(true)->getId() == $sArtId) {
                    $dArtStock += $oOrderArticle->getAmount();
                }
            }
        }

        return $dArtStock;
    }