hr_payroll_cancel/hr_payslip_view.xml

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

        <record id="view_cancel_payslip_form" model="ir.ui.view">
                <field name="name">view.cancel.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="//button[@string='Cancel Payslip']" position="attributes">
                        <attribute name="states">draft,hr_check,confirm,verify,done</attribute>
                    </xpath>
                </field>
        </record>

    </data>
</openerp>