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). -->
<openerp>
<data>

<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"/>

</data>
</openerp>