I created group for user :
<?xml version="1.0" encoding="utf-8" ?>
<odoo>
<data>
<!-- *** the new user group -->
<record id="group_hr_leave_approver" model="res.groups">
<field name="name">** Leave Approver</field>
<field name="implied_ids" eval="[(4, ref('base.group_user'))]"/>
</record>
</data>
</odoo>
i need to make only users who have this group to approve time off . how can i do that?