i try to extend the register payment dialog to show a computed custom field.

but without success.

adding the Field:

        <record model="ir.ui.view" id="account_inherit_view_account_payment_invoice_form">
            <field name="name">x_account.account.inherit_view_account_payment_invoice_form</field>
            <field name="model">account.payment</field>
            <field name="inherit_id" ref="account.view_account_payment_invoice_form" />
            <field name="arch" type="xml">
                <xpath expr="//field[@name='journal_id']" position="after">
                    <field name="x_payment_term_to_pay_info" />
                </xpath>
            </field>
        </record>

Model extended by:

class account_payment(models.Model):
    _inherit = "account.payment"

    x_payment_term_to_pay_info = fields.Char(string="Zahlungsbedingungen", compute='get_x_payment_term_to_pay_info')

    @api.one
    def get_x_payment_term_to_pay_info(self):
        self.x_payment_term_to_pay_info = "TEST"
        return x_payment_term_to_pay_info

But the value will not be shown in "Register Payment" wizard that ist called from an invoice.

any ideas?