cooperative-market/admin_technical_features/res_groups.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="0">
        <record id="base.group_no_one" model="res.groups">
            <field name="users" eval="[(4, ref('base.user_root'))]"/>
        </record>
    </data>
</openerp>