partner-contact/partner_contact_department/views/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2014 Serv. Tecnol. Avanzados - Pedro M. Baeza
     © 2015 Antiun Ingeniería S.L. - Antonio Espinosa
     © 2015 Antiun Ingeniería S.L. - Jairo Llopis
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->

<openerp>
<data>

<record model="ir.ui.view" id="view_partner_form_department">
    <field name="name">Partner form with department</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form"/>
    <field name="arch" type="xml">
        <xpath expr="//sheet/group//field[@name='function']" position="after">
            <field name="department_id"
                   placeholder="Department"
                   attrs="{'invisible': [('is_company','=', True)]}"
                   options='{"no_open": True}'/>
        </xpath>
        <xpath expr="//field[@name='child_ids']/form//field[@name='function']"
               position="after">
            <field name="is_company" invisible="True"/>
            <field name="department_id"
                   placeholder="Department"
                   attrs="{'invisible': [('is_company','=', True)]}"
                   options='{"no_open": True}'/>
        </xpath>
    </field>
</record>

<record model="ir.ui.view" id="view_res_partner_filter_department">
    <field name="name">Partner search with department</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_res_partner_filter"/>
    <field name="arch" type="xml">
        <field name="category_id" position="after">
            <field name="department_id"/>
        </field>
        <filter string="Salesperson" position="after">
            <filter string="Department"
                    domain="[('is_company', '=', False)]"
                    context="{'group_by': 'department_id'}"/>
        </filter>
    </field>
</record>

</data>
</openerp>