account-reconcile/account_statement_cancel_line/wizard/cancel_statement_line_view.xml

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

        <record id="view_wizard_cancel_statement_line_form" model="ir.ui.view">
            <field name="name">view.wizard.cancel.statement.line.form</field>
            <field name="model">wizard.cancel.statement.line</field>
            <field name="arch" type="xml">
                <form string="Reconciled Entries" version="7.0">
                    <separator string="Unreconciliation"/>
                    <label string="Some entries are already reconciled. Do you want to unreconcile them and proceed?"/>
                    <footer>
                        <button name="unreconcile" string="Unreconcile" type="object" class="oe_highlight"/>
                        or
                        <button string="Cancel" class="oe_link" special="cancel"/>
                    </footer>
                </form>
            </field>
        </record>

    </data>
</openerp>