tryton/modules/account_invoice/view/pay_start_form.xml

<?xml version="1.0"?>
<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
this repository contains the full copyright notices and license terms. -->
<form cursor="amount">
    <label name="payee"/>
    <field name="payee"/>
    <label name="amount"/>
    <field name="amount"/>

    <label name="description"/>
    <field name="description" colspan="3"/>
    <label name="payment_method"/>
    <field name="payment_method" widget="selection"/>
    <label name="date"/>
    <field name="date"/>
</form>