tryton/view/extra_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>
    <label name="name"/>
    <field name="name"/>
    <label name="active"/>
    <field name="active"/>
    <label name="start_date"/>
    <field name="start_date"/>
    <label name="end_date"/>
    <field name="end_date"/>
    <label name="company"/>
    <field name="company"/>
    <label name="price_list"/>
    <field name="price_list"/>
    <separator id="pattern" colspan="4"/>
    <label name="sale_amount"/>
    <field name="sale_amount"/>
    <field name="lines" colspan="4"
        view_ids="sale_extra.extra_line_view_list_sequence"/>
</form>