private function getStockItemId($prodId, $stockId)
    {
        $query = $this->qbGetStockItem->build();
        $conn = $query->getConnection();
        $bind = [
            OwnQbGetStockItem::BND_PROD_ID => $prodId,
            OwnQbGetStockItem::BND_STOCK_ID => $stockId
        ];
        $result = $conn->fetchOne($query, $bind);
        return $result;
    }