<?xml version="1.0"?>
<search>
                <field name="reference"/>
                <field name="provider_id"/>
                <field name="partner_id"/>
                <field name="partner_name"/>
                <group expand="1" string="Group By">
                    <filter string="Provider" name="provider_id" context="{'group_by': 'provider_id'}"/>
                    <filter string="Partner" name="partner_id" context="{'group_by': 'partner_id'}"/>
                    <filter string="Status" name="state" context="{'group_by': 'state'}"/>
                    <filter string="Company" name="company" context="{'group_by': 'company_id'}" groups="base.group_multi_company"/>
                </group>
            </search>
        