<record id="view_purchase_order_tree_onboarding" model="ir.ui.view">
    <field name="name">purchase.order.tree</field>
    <field name="model">purchase.order</field>
    <field name="inherit_id" ref="purchase.purchase_order_tree"/>
    <field name="mode">primary</field>
    <field name="arch" type="xml">
        <xpath expr="//tree" position="attributes">
            <attribute name="banner_route">/purchase/onboarding_panel</attribute>
        </xpath>
    </field>
</record>

When inherit  (purchase.requisition) tree view, i achieve what i expect. But with purchase.order tree view, the method fails. Is there anyway around to do that?

Thanks