<?xml version="1.0"?>
<data><form position="attributes">
                <attribute name="edit">true</attribute>
            </form>
            <field name="product_id" position="attributes">
                <attribute name="domain">[('type', '=', 'service')]</attribute>
                <attribute name="context">{
                    'default_type': 'service',
                    'default_service_policy': 'ordered_prepaid',
                }</attribute>
            </field>
        </data>