I want to hidde the "Cleint" group for group "A" (i.e users  from group "A" can't
 choose (or see) the group "Client" in Access right menu. This my rule definition : 

 <record model="res.groups" id="group_information_client" >
         <field name="name">Client</field>
         <field name="category_id" ref="affichage.module_category_affichage"/>
<field name="implied_ids" eval="[(4, ref('base.group_erp_manager')),(4, ref('gestion_parcelles.group_ferme_admin'))]"/>
         <field name="users" eval="[(4, ref('base.user_root'))]"/>
     </record>