<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data noupdate="1">
         <record model="pos.config" id="point_of_sale.pos_config_main">
            <field name="iface_available_categ_ids" eval="[(4, ref('pos_event.pos_category_event'))]" />
        </record>
    </data>
</odoo>
