i want to creat an acces application (ir.module.category) for an existing module (let's say my_existing is its name )via a custom module (my_module),

i proceed this way by creating a new category record, to be able after to attach it with new groups.

<data noupdate="0"> 
<record id="my_existing.module_category_reclamation" model="ir.module.category" > <field name="name">Reclamation</field> 
<field name="sequence">22</field> 
<field name="description">Helps you manage your reclamations.</field> 
</record> 
</data>

and for the group 

 <record id="group_reclamation_user" model="res.groups"> 
<field name="name">Utilisateurs</field> 
<field name="category_id" ref="my_existing.module_category_reclamation"/> 
</record>

but still get external 

  "Cannot update missing record 'my_existing.module_category_reclamation'" 

am i missing something ?