<xpath expr="//sheet/notebook" position="inside">

                <page string="RELSUM" name="relsum">

                    <group>

                        <group>

                            <field name="repair_order_id"/>

                            <field name="tipo_albaran"/>

                        </group>

                        <group>

                            <field name="legacy_reference" optional="hide"/>

                        </group>

                    </group>

                </page>

            </xpath>