odoo-contact-addons/l10n_fr_department_state/views/res_partner.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="view_partner_form_inherit_base" model="ir.ui.view">
    <field name="name">res.partner.view.form.inherit</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form" />
    <field name="priority">82</field>
    <field name="arch" type="xml">
      <field name="state_id" position="attributes">
        <attribute name="attrs">{'readonly':[('country_department_id','!=',False)]}</attribute>
        <attribute name="options">{'no_open':1}</attribute>
      </field>
      <field name="country_department_id" position="attributes">
        <attribute name="options">{'no_open':1}</attribute>
      </field>
    </field>
  </record>

  <record id="view_res_partner_filter_inherit_base" model="ir.ui.view">
    <field name="name">res.partner.view.search.inherit</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_res_partner_filter" />
    <field name="priority">82</field>
    <field name="arch" type="xml">
      <filter name="country_department_groupby" position="after">
        <filter name="state_groupby" string="State" context="{'group_by': 'state_id'}" />
      </filter>
    </field>
  </record>

</odoo>