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 :">
				    <group col="2" colspan="4">
				    	<field name="date_start"/>
				    	<field name="date_end"/>
                		<button icon='gtk-cancel' special="cancel"
                			string="Close" />
                		<button name="print_report" string="Print Report"
                			colspan="1" type="object" icon="gtk-ok" />
                	</group>
                </form>
            </field>
        </record>


        <record id="action_report_pos_details" model="ir.actions.act_window">
            <field name="name">Print Report</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>
            <field name="context">{'record_id' : active_id}</field>
        </record>
<!--    <act_window name="POS Details"
            res_model="pos.details"
            src_model="pos.order"
		    view_mode="form"
		    target="new"        
            key2="client_action_multi"    
		    id="action_report_pos_details"/>   -->
        
	</data>
</openerp>