tryton/modules/project_invoice/view/work_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. -->
<data>
    <xpath
        expr="/form/notebook/page[@id='general']/group[@id='progress']"
        position="after">
        <label name="project_invoice_method"/>
        <field name="project_invoice_method"/>
    </xpath>
    <xpath expr="//field[@name='list_price']" position="after">
        <label name="project_invoice_timesheet_up_to"/>
        <field name="project_invoice_timesheet_up_to"/>
    </xpath>
    <xpath expr="/form/notebook/page[@id='general']/field[@name='total_effort']" position="after">
        <label name="amount_to_invoice"/>
        <field name="amount_to_invoice"/>
    </xpath>
    <xpath expr="/form/notebook/page[@id='general']/field[@name='revenue']" position="after">
        <label name="invoiced_amount"/>
        <field name="invoiced_amount"/>
    </xpath>
    <xpath expr="/form/notebook/page[@id='general']/group/group[@id='buttons']"
        position="inside">
        <button name="invoice"/>
    </xpath>
    <xpath expr="/form/notebook" position="inside">
        <page name="invoiced_progress">
            <field name="invoiced_progress" colspan="4"/>
        </page>
    </xpath>
</data>