<record id="camp_event_group_manager" model="res.groups">
        <field name="name"> Manager </field>
        <field name="category_id" ref="camp_event_category" />
        <field name="implied_ids" eval="[(4, ref('camp_event_group_user'))]" />
        <field name="users"       eval="[(4, ref('base.user_root')),(4, ref('base.user_admin'))]" />
    </record>