protected function isDeliveryRuleFitByArticle($artAmount)
    {
        $result = false;
        if ($this->getCalculationRule() != self::CALCULATION_RULE_ONCE_PER_CART) {
            if (!$this->_blFreeShipping && $this->_checkDeliveryAmount($artAmount)) {
                $result = true;
            }
        }

        return $result;
    }