protected function _getBasketItems($oDiscount = null)
    {
        if ($this->oxvouchers__oxorderid->value) {
            return $this->_getOrderBasketItems($oDiscount);
        } elseif ($this->getSession()->getBasket()) {
            return $this->_getSessionBasketItems($oDiscount);
        } else {
            return [];
        }
    }