tryton/modules/stock_package/view/package_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="type"/>
    <field name="type" widget="selection"/>
    <label name="number"/>
    <field name="number"/>
    <label name="parent"/>
    <field name="parent"/>
    <label name="company"/>
    <field name="company"/>
    <label name="shipment"/>
    <field name="shipment"/>
    <notebook colspan="4">
        <page name="moves">
            <field name="moves" colspan="4" widget="many2many"/>
        </page>
        <page name="children">
            <field name="children" colspan="4"/>
        </page>
        <page string="Measurements" col="3" id="measurements">
            <label name="length"/>
            <field name="length"/>
            <field name="length_uom" widget="selection"/>

            <label name="height"/>
            <field name="height"/>
            <field name="height_uom" widget="selection"/>

            <label name="width"/>
            <field name="width"/>
            <field name="width_uom" widget="selection"/>

            <label name="packaging_volume"/>
            <field name="packaging_volume"/>
            <field name="packaging_volume_uom" widget="selection"/>

            <label name="packaging_weight"/>
            <field name="packaging_weight"/>
            <field name="packaging_weight_uom"/>
        </page>
    </notebook>
    <label name="state"/>
    <field name="state"/>
</form>