trytond-production_quality_control/view/production_form.xml

<data>
    <xpath expr="/form/notebook" position="inside">
        <page id="quality" string="Quality">
            <label name="time_since_quality_control"/>
            <field name="time_since_quality_control"/>
            <field name="quality_tests" colspan="4"/>
        </page>
    </xpath>
</data>