protected function _getParentProduct($parentId)
    {
        if ($parentId && $this->_oParentProd === null) {
            $this->_oParentProd = false;
            $article = oxNew(\OxidEsales\Eshop\Application\Model\Article::class);
            if (($article->load($parentId))) {
                $this->_processProduct($article);
                $this->_oParentProd = $article;
            }
        }

        return $this->_oParentProd;
    }