protected function _addOrderArticlesToBasket($oBasket, $aOrderArticles)
    {
        // if no order articles, return empty basket
        if (count($aOrderArticles) > 0) {
            //adding order articles to basket
            foreach ($aOrderArticles as $oOrderArticle) {
                $oBasket->addOrderArticleToBasket($oOrderArticle);
            }
        }
    }