vertical-cooperative/easy_my_coop/security/res_groups.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <record id="group_easy_my_coop_user" model="res.groups">
        <field name="name">User</field>
        <field name="category_id" ref="module_category_cooperator_management"/>
        <field name="implied_ids"
               eval="[(6, 0, [ref('base.group_user'), ref('account.group_account_invoice')])]"/>
    </record>

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