<?xml version="1.0"?>
<data><xpath expr="//field[@name='product_id']" position="before">
                    <field name="order_reference"/>
                </xpath>

                <xpath expr="//filter[@name='confirmed']" position="after">
                    <filter string="Unpaid Orders" name="unpaid" domain="[('state', '=', 'sent')]"/>
                    <filter string="Abandoned Carts" name="abandoned" domain="[('is_abandoned_cart', '=', True)]" invisible="1"/>
                </xpath>
            </data>