public function getArticleId()
    {
        if ($this->_sArticleId === null) {
            // passing wishlist information
            if ($articleId = \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('aid')) {
                $this->_sArticleId = $articleId;
            }
        }

        return $this->_sArticleId;
    }