<data>
    <xpath expr="/form/notebook" position="inside">
        <page string="Customs Value" id="customs_values">
            <label name="country_of_origin"/>
            <field name="country_of_origin" colspan="3"/>
            <label name="use_list_price_as_customs_value"/>
            <field name="use_list_price_as_customs_value"/>
            <label name="customs_value"/>
            <field name="customs_value"/>
        </page>
    </xpath>
</data>

<data>
    <xpath expr="/form/notebook" position="inside">
        <page string="Customs" id="customs_values">
            <label name="country_of_origin"/>
            <field name="country_of_origin" colspan="3"/>
            <label name="use_list_price_as_customs_value"/>
            <field name="use_list_price_as_customs_value"/>
            <label name="customs_value"/>
            <field name="customs_value"/>
        </page>
    </xpath>
</data>

Change string custom values to custom
Change string custom values to custom
