partner-contact/partner_sector/views/res_partner_sector_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2015 Antiun Ingenieria S.L. - Javier Iniesta
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
<odoo>

    <record id="res_partner_sector_action" model="ir.actions.act_window">
        <field name="name">Sectors</field>
        <field name="res_model">res.partner.sector</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree</field>
    </record>

    <record id="res_partner_sector_tree_view" model="ir.ui.view">
        <field name="name">Partner Sector tree</field>
        <field name="model">res.partner.sector</field>
        <field name="arch" type="xml">
            <tree string="Sectors" editable="top">
                <field name="name"/>
                <field name="parent_id"/>
            </tree>
        </field>
    </record>

    <menuitem action="res_partner_sector_action"
              id="menu_res_partner_sector"
              name="Sectors"
              parent="base.menu_config_address_book"
              sequence="3"/>

</odoo>