travel_view.xml

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

    <record model="ir.ui.view" id="travel_tree_view">
      <field name="name">Travel Tree HR View</field>
      <field name="model">travel.travel</field>
      <field name="inherit_id" ref="travel.travel_tree_view" />
      <field name="arch" type="xml">

          <field name="date_stop" position="after">
            <field name="department_id"/>
          </field>

      </field>
    </record>

    <record model="ir.ui.view" id="travel_form_view">
      <field name="name">Travel Form HR View</field>
      <field name="model">travel.travel</field>
      <field name="inherit_id" ref="travel.travel_form_view" />
      <field name="arch" type="xml">

        <field name="date_stop" position="after">
          <field name="department_id"
                 required="True"
                 options="{'create': false, 'create_edit': false}"/>
        </field>

        <field name="partner_id" position="after">
          <field name="department_id" readonly="1"/>
        </field>

      </field>
    </record>

    <record model="ir.actions.act_window" id="travel.action_travels_tree_list">
      <field name="domain">[('department_rule', '=', uid)]</field>
    </record>

  </data>
</openerp>