odoo/addons/point_of_sale/wizard/pos_details.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <!--   pos.details -->

        <record id="view_pos_details" model="ir.ui.view">
            <field name="name">POS Details</field>
            <field name="model">pos.details</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <form string="POS Details">
                    <header>
                            <button icon='gtk-cancel' special="cancel"
                                    string="Close" />
                            <button name="print_report" string="Print Report"
                                    colspan="1" type="object" icon="gtk-print" />
                    </header>
                    <group col="4" string="Dates">
                        <field name="date_start"/>
                        <field name="date_end"/>
                    </group>
                    <field name="user_ids"/>
                </form>
            </field>
        </record>


        <record id="action_report_pos_details" model="ir.actions.act_window">
            <field name="name">Sale Details</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">pos.details</field>
            <field name="view_type">form</field>
            <field name="view_mode">form</field>
            <field name="target">new</field>
        </record>


    </data>
</openerp>