Hello,

I have a field named "field1",  that field should be not editable by user who has group named "Bloc fields" checked.

My test code is below:

 1/file.xml

 <record id="res_partner_form_update" model="ir.ui.view">

    <field name="name">res.partner.form.update</field>

    <field name="model">res.partner</field>

    <field name="inherit_id" ref="base.view_partner_form"/>

    <field name="groups_id" eval="[(4,ref('custom_module.bloc_fields'))]"/>

    <field name="arch" type="xml">

    <xpath expr="//field[@name='user_id']" position="after">

        <field name="field1"/>

    </xpath>

    </field>

</record>

2/security.xml

 <record id="bloc_fields" model="res.groups">

    <field name="name">Bloc fields</field>

    <field name="comment">Enable/Disable fields</field> 

</record>

3/ir.model.access.csv

"id","name","model_id:id","group_id:id","perm_read","perm_write","perm_create","perm_unlink"

"access_res_partner_bloc_fields","res_partner bloc_fields","base.model_res_partner","bloc_fields",1,0,0,0

Result:

the field "field1" is gone, it is no longer visible but when i comment  

<!-- <field name="groups_id" eval="[(4,ref('custom_module.bloc_fields'))]"/> --> it will be displayed