tra_backend/hr_vacation_mngmt/views/hr_employee_ticket.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="view_hr_flight_ticket_form" model="ir.ui.view">
            <field name="name">hr.flight.ticket.form</field>
            <field name="model">hr.flight.ticket</field>
            <field name="priority" eval="0"/>
            <field name="arch" type="xml">
                <form string="Flight Ticket" create="0">
                    <header>
                        <button name="confirm_ticket" states="booked" string="Confirm" type="object" class="oe_highlight"/>
                        <button name="cancel_ticket" string="Cancel" type="object" states="booked,confirmed"/>
                        <field name="state" widget="statusbar"
                               statusbar_visible="booked,confirmed,started,completed"/>
                    </header>
                    <sheet>
                    <div class="oe_button_box" name="button_box">
                        <button name="action_view_invoice"
                            string="Invoice"
                            type="object"
                            class="oe_stat_button"
                            icon="fa-pencil-square-o"
                            attrs="{'invisible':[('invoice_id','=', False)]}">
                        </button>
                        <field name="invoice_id" invisible="1"/>
                    </div>
                    <div class="oe_title">
                        <h1><field name="display_name"/></h1>
                    </div>
                    <group>
                        <group>
                            <field name="employee_id" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="depart_from" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="date_start" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="ticket_class" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="flight_details" attrs="{'readonly': [('state','=','completed')]}"/>
                            <field name="company_id" invisible="1"/>
                        </group>
                        <group>
                            <field name="ticket_type" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="destination" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="date_return" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="ticket_fare" attrs="{'readonly': [('state','in',('confirmed','started','completed'))]}"/>
                            <field name="leave_id" invisible="1"/>
                            <field name="return_flight_details"
                                   attrs="{'readonly': [('state','=','completed')],
                                   'invisible':[('ticket_type', '=', 'one')]}"/>
                        </group>
                    </group>
                    </sheet>
               </form>
            </field>
        </record>

        <record id="view_hr_flight_ticket_tree" model="ir.ui.view">
            <field name="name">hr.flight.ticket.form</field>
            <field name="model">hr.flight.ticket</field>
            <field name="priority" eval="1"/>
            <field name="arch" type="xml">
                <tree string="Flight Ticket" create="0">
                    <field name="employee_id"/>
                    <field name="date_start"/>
                    <field name="date_return"/>
                    <field name="ticket_type"/>
                    <field name="state"/>
               </tree>
            </field>
        </record>

        <record id="view_hr_book_flight_ticket_form" model="ir.ui.view">
            <field name="name">hr.flight.ticket.form</field>
            <field name="model">hr.flight.ticket</field>
            <field name="priority" eval="2"/>
            <field name="arch" type="xml">
                <form string="Flight Ticket" create="0">
                    <div class="oe_title">
                        <h1><field name="name" readonly="1"/></h1>
                    </div>
                    <group>
                        <group>
                            <field name="employee_id" readonly="1"/>
                            <field name="depart_from"/>
                            <field name="date_start"/>
                            <field name="ticket_class"/>
                        </group>
                        <group>
                            <field name="ticket_type"/>
                            <field name="destination"/>
                            <field name="date_return"/>
                            <field name="leave_id" invisible="1"/>
                        </group>
                    </group>
                    <footer>
                        <button name="book_ticket" type="object" string="Book Ticket" class="btn-primary"/>
                        <button string="Cancel" class="btn-default" special="cancel"/>
                    </footer>
               </form>
            </field>
        </record>

        <record id="action_hr_flight_tickets" model="ir.actions.act_window">
            <field name="name">Flight Tickets</field>
            <field name="res_model">hr.flight.ticket</field>
            <field name="view_mode">tree,form</field>
        </record>

        <menuitem
            id="menu_hr_flight_tickets"
            name="Flight Tickets"
            parent="hr_holidays.menu_hr_holidays_root"
            action="action_hr_flight_tickets"
            groups="hr_holidays.group_hr_holidays_manager"
            sequence="5"/>
    </data>
</odoo>