hr_payslip_print_policy/views/hr_payslip_run_views.xml
<?xml version="1.0" encoding="utf-8" ?>
<openerp>
<data>
<record id="hr_payslip_run_view_form" model="ir.ui.view">
<field name="name">hr.payslip.run.print.policy.form</field>
<field name="model">hr.payslip.run</field>
<field name="inherit_id" ref="hr_payroll.hr_payslip_run_form" />
<field name="arch" type="xml">
<xpath expr="//field[@name='state']" position="before">
<button
name="%(base_print_policy.base_print_document_action)d"
string="Print"
type="action"
icon="gtk-print"
/>
</xpath>
</field>
</record>
</data>
</openerp>