hr_payslip_view.xml

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

        <record id="view_hr_payslip_form" model="ir.ui.view">
            <field name="name">hr.payslip.form</field>
            <field name="model">hr.payslip</field>
            <field name="inherit_id" ref="hr_payroll.view_hr_payslip_form"/>
            <field name="arch" type="xml">
            	<xpath expr="//field[@name='line_ids']//field[@name='total']" position="after">
            		<field name="total_ytd"/>
            	</xpath>
            </field>
        </record>
    </data>
</openerp>