partner-contact/base_location_nuts/views/res_partner_nuts_view.xml

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

<record id="res_partner_nuts_tree" model="ir.ui.view">
    <field name="name">NUTS Items tree</field>
    <field name="model">res.partner.nuts</field>
    <field name="arch" type="xml">
        <tree string="NUTS Items">
            <field name="level"/>
            <field name="code"/>
            <field name="name"/>
        </tree>
    </field>
</record>

<record id="res_partner_nuts_form" model="ir.ui.view">
    <field name="name">NUTS Items tree</field>
    <field name="model">res.partner.nuts</field>
    <field name="arch" type="xml">
        <form string="NUTS Item">
            <group>
                <group>
                    <field name="level"/>
                    <field name="code"/>
                    <field name="parent_id"/>
                    <field name="name"/>
                </group>
                <group>
                    <field name="country_id"/>
                    <field name="state_id"/>
                </group>
            </group>
        </form>
    </field>
</record>

<record id="res_partner_nuts_action" model="ir.actions.act_window">
    <field name="name">NUTS Items</field>
    <field name="type">ir.actions.act_window</field>
    <field name="res_model">res.partner.nuts</field>
    <field name="view_type">form</field>
    <field name="view_mode">tree,form</field>
    <field name="help">You must click at import wizard to populate NUTS items
        in Odoo database in:
        Sales > Configuration > Address Book > Localization > Import NUTS 2013</field>
</record>

<record model="ir.ui.view" id="view_res_partner_nuts_filter">
    <field name="name">NUTS search filters</field>
    <field name="model">res.partner.nuts</field>
    <field name="arch" type="xml">
        <search string="Search NUTS">
            <field name="name"/>
            <field name="country_id"/>
            <field name="state_id"/>
            <group expand="0" string="Group By">
                <filter string="Country"
                        domain="[]"
                        context="{'group_by': 'country_id'}"/>
                <filter string="Level"
                        domain="[]"
                        context="{'group_by': 'level'}"/>
            </group>
        </search>
    </field>
</record>

<menuitem action="res_partner_nuts_action"
          id="res_partner_nuts_menu"
          name="NUTS Items"
          parent="sales_team.menu_localisation"
          sequence="40"/>

</odoo>