diff --git a/addons/account_voucher/voucher_sales_purchase_view.xml b/addons/account_voucher/voucher_sales_purchase_view.xml
index 3367b08583b..c7cee57220f 100644
--- a/addons/account_voucher/voucher_sales_purchase_view.xml
+++ b/addons/account_voucher/voucher_sales_purchase_view.xml
@@ -158,7 +158,7 @@
                                    <field name="state"/>
                                    <field name="reconcile_id"/>
                                </tree>
-                            </field> 
+                            </field>
                         </page>
                     </notebook>
                     <group col="8" colspan="4">
@@ -167,7 +167,7 @@
                         <button name="cancel_voucher" string="Cancel" type="object" states="posted" icon="terp-stock_effects-object-colorize" confirm="Are you sure to confirm this record ?"/>
                         <button name="proforma_voucher" string="Validate" states="draft" icon="gtk-go-forward"/>
                         <group attrs="{'invisible':[('state','!=','posted')]}">
-                           <button icon="terp-dolar_ok!" name="%(act_pay_voucher)d" context="{'narration':narration, 'title':'Customer Payment', 'type':'receipt', 'partner_id':partner_id, 'reference':reference, 'amount':amount}" type="action" string="Pay" attrs="{'invisible':[('pay_now','!=','pay_now')]}"/>
+                           <button icon="terp-dolar_ok!" name="%(act_pay_voucher)d" context="{'narration':narration, 'title':'Customer Payment', 'type':'receipt', 'partner_id':partner_id, 'reference':reference, 'amount':amount}" type="action" string="Pay" attrs="{'invisible':[('pay_now','=','pay_now')]}"/>
                         </group>
                         <button name="action_cancel_draft" type="object" states="cancel" string="Set to Draft" icon="terp-stock_effects-object-colorize"/>
                     </group>
@@ -278,7 +278,7 @@
                                    <field name="state"/>
                                    <field name="reconcile_id"/>
                                </tree>
-                            </field> 
+                            </field>
                         </page>
                     </notebook>
                     <group col="10" colspan="4">