async downPaymentSO(sale_order, isPercentage) {
        if (!this.config.down_payment_product_id && this.config.raw.down_payment_product_id) {
            await this.data.read("product.product", [this.config.raw.down_payment_product_id]);
        }
        if (!this.config.down_payment_product_id) {
            this.dialog.add(AlertDialog, {
                title: _t("No down payment product"),
                body: _t(
                    "It seems that you didn't configure a down payment product in your point of sale. You can go to your point of sale configuration to choose one."
                ),
            });
            return;
        }
        const payload = await makeAwaitable(this.dialog, NumberPopup, {
            title: _t("Down Payment"),
            subtitle: sprintf(
                _t("Due balance: %s | Total Amount: %s"),
                this.env.utils.formatCurrency(sale_order.amount_unpaid),
                this.env.utils.formatCurrency(sale_order.amount_total)
            ),
            buttons: enhancedButtons(),
            formatDisplayedValue: (x) => (isPercentage ? `% ${x}` : x),
            feedback: (buffer) =>
                isPercentage && buffer
                    ? `(${this.env.utils.formatCurrency(
                          (sale_order.amount_total * parseFloat(buffer)) / 100
                      )})`
                    : "",
        });
        if (!payload) {
            return;
        }
        const userValue = parseFloat(payload);
        let proposed_down_payment = userValue;
        if (isPercentage) {
            const down_payment_tax = this.models["account.tax"].get(
                this.config.down_payment_product_id.taxes_id
            );
            const percentageBase =
                !down_payment_tax || down_payment_tax.price_include
                    ? sale_order.amount_total
                    : sale_order.amount_total;
            proposed_down_payment = (percentageBase * userValue) / 100;
        }
        if (proposed_down_payment > sale_order.amount_unpaid) {
            this.dialog.add(AlertDialog, {
                title: _t("Error amount too high"),
                body: _t(
                    "You have tried to charge a down payment of %s but only %s remains to be paid, %s will be applied to the purchase order line.",
                    this.env.utils.formatCurrency(proposed_down_payment),
                    this.env.utils.formatCurrency(sale_order.amount_unpaid),
                    this.env.utils.formatCurrency(sale_order.amount_unpaid || 0)
                ),
            });
            proposed_down_payment = sale_order.amount_unpaid || 0;
        }
        this._createDownpaymentLines(sale_order, proposed_down_payment);
    },