<?xml version="1.0"?>
<filter name="combo" position="after">
                <separator/>
                <filter string="Time-based services" name="product_time_based" domain="[('type', '=', 'service'), ('invoice_policy', '=', 'delivery'), ('service_type', '=', 'timesheet')]"/>
                <filter string="Fixed price services" name="product_service_fixed" domain="[('type', '=', 'service'), ('invoice_policy', '=', 'order'), ('service_type', '=', 'timesheet')]"/>
                <filter string="Milestone services" name="product_service_milestone" domain="[('type', '=', 'service'), ('invoice_policy', '=', 'delivery'), ('service_type', '=', 'manual')]"/>
            </filter>
        