tryton/modules/purchase_request/purchase.xml

<?xml version="1.0"?>
<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
this repository contains the full copyright notices and license terms. -->
<tryton>
    <data>
        <record model="ir.ui.view" id="purchase_line_view_form">
            <field name="model">purchase.line</field>
            <field name="inherit" ref="purchase.purchase_line_view_form"/>
            <field name="name">purchase_line_form</field>
        </record>
        <record model="ir.action.act_window" id="act_open_request_form">
            <field name="name">Purchase Requests</field>
            <field name="res_model">purchase.request</field>
            <field name="domain"
                eval="[('purchase', 'in', Eval('active_ids'))]"
                pyson="1"/>
        </record>
        <record model="ir.action.keyword" id="act_open_request_keyword">
            <field name="keyword">form_relate</field>
            <field name="model">purchase.purchase,-1</field>
            <field name="action" ref="act_open_request_form"/>
        </record>
    </data>
</tryton>