public function getPromotionIds($i = 0, $j = null){
        if (isset($this->itemList[$i]['PromotionIds'])){
            if (isset($this->itemList[$i]['PromotionIds'][$j])){
                return $this->itemList[$i]['PromotionIds'][$j];
            } else {
                return $this->itemList[$i]['PromotionIds'];
            }
        } else {
            return false;
        }
    }