tryton/modules/purchase/party.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="party_view_form">
            <field name="model">party.party</field>
            <field name="inherit" ref="party.party_view_form"/>
            <field name="name">party_form</field>
        </record>

        <record model="ir.model.field.access" id="access_party_supplier_currency">
            <field name="field" search="[('model.model', '=', 'party.party'), ('name', '=', 'supplier_currency')]"/>
            <field name="perm_read" eval="True"/>
            <field name="perm_write" eval="False"/>
        </record>
        <record model="ir.model.field.access" id="access_party_supplier_currency_group_sale">
            <field name="field" search="[('model.model', '=', 'party.party'), ('name', '=', 'supplier_currency')]"/>
            <field name="group" ref="group_purchase"/>
            <field name="perm_read" eval="True"/>
            <field name="perm_write" eval="True"/>
        </record>
    </data>
</tryton>