odoo16/addons/purchase/report/purchase_bill_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

   <record id="view_purchase_bill_union_filter" model="ir.ui.view">
        <field name="name">purchase.bill.union.select</field>
        <field name="model">purchase.bill.union</field>
        <field name="arch" type="xml">
            <search string="Search Reference Document">
                <field name="name" string="Reference" filter_domain="['|', ('name','ilike',self), ('reference','=like',self+'%')]"/>
                <field name="amount"/>
                <separator/>
                <field name="partner_id" operator="child_of"/>
                <separator/>
                <filter name="purchase_orders" string="Purchase Orders" domain="[('purchase_order_id', '!=', False)]"/>
                <filter name="vendor_bills" string="Vendor Bills" domain="[('vendor_bill_id', '!=', False)]"/>
            </search>
        </field>
    </record>

    <record id="view_purchase_bill_union_tree" model="ir.ui.view">
        <field name="name">purchase.bill.union.tree</field>
        <field name="model">purchase.bill.union</field>
        <field name="arch" type="xml">
            <tree string="Reference Document">
                <field name="name"/>
                <field name="reference"/>
                <field name="partner_id"/>
                <field name="date"/>
                <field name="amount"/>
                <field name="currency_id" invisible="1"/>
                <field name="company_id" groups="base.group_multi_company" options="{'no_create': True}"/>
            </tree>
        </field>
    </record>

</odoo>