public static function buildItemTypeDiscount(
        $product_reference,
        $name,
        $unit_price,
        $tax_rate,
        $discount,
        $discount_description,
        $total_amount
    ) {
        return self::initInternalItem($product_reference,
            $name,
            1,
            $unit_price,
            $tax_rate,
            $discount,
            $total_amount,
            TypeItems::DISCOUNT,
            $discount_description);
    }