tryton/modules/customs/view/tariff_code_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="code"/>
    <field name="code"/>
    <label name="active"/>
    <field name="active"/>
    <label name="description"/>
    <field name="description" colspan="3"/>

    <label name="country"/>
    <field name="country" colspan="3"/>

    <label name="organization"/>
    <field name="organization" colspan="3"/>

    <label id="from" string="From"/>
    <group id="start" col="2">
        <field name="start_day"/>
        <field name="start_month" widget="selection"/>
    </group>
    <label id="to" string="To"/>
    <group id="end" col="2">
        <field name="end_day"/>
        <field name="end_month" widget="selection"/>
    </group>
</form>