tryton/modules/stock_supply/purchase_request.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_configuration_view_form">
            <field name="model">purchase.configuration</field>
            <field name="inherit" ref="purchase.purchase_configuration_view_form"/>
            <field name="name">purchase_configuration_form</field>
        </record>

        <record model="ir.model.access" id="access_purchase_request_stock">
            <field name="model" search="[('model', '=', 'purchase.request')]"/>
            <field name="group" ref="stock.group_stock_admin"/>
            <field name="perm_read" eval="True"/>
            <field name="perm_write" eval="False"/>
            <field name="perm_create" eval="False"/>
            <field name="perm_delete" eval="False"/>
        </record>
    </data>
</tryton>