diff --git a/invoice.py b/invoice.py
index e647fb9129..544b68558c 100644
--- a/invoice.py
+++ b/invoice.py
@@ -8,7 +8,7 @@ from trytond.report import Report
 from trytond.wizard import Wizard, StateView, StateTransition, StateAction, \
     Button
 from trytond.backend import TableHandler, FIELDS
-from trytond.pyson import If, Eval, Bool
+from trytond.pyson import If, Eval, Bool, Id
 from trytond.tools import reduce_ids
 from trytond.transaction import Transaction
 from trytond.pool import Pool
@@ -204,6 +204,11 @@ class Invoice(Workflow, ModelSQL, ModelView):
                 'open': {
                     'invisible': ~Eval('state').in_(['draft', 'proforma']),
                     },
+                'pay': {
+                    'invisible': Eval('state') != 'open',
+                    'readonly': ~Eval('groups', []).contains(
+                        Id('account', 'group_account')),
+                    },
                 })
 
     def init(self, module_name):
@@ -1285,6 +1290,10 @@ class Invoice(Workflow, ModelSQL, ModelView):
             self.create_move(invoice)
             self.print_invoice(invoice)
 
+    @ModelView.button_action('account_invoice.wizard_pay')
+    def pay(self, ids):
+        pass
+
     def process(self, ids):
         paid = []
         open_ = []
diff --git a/invoice.xml b/invoice.xml
index 3a1b94ae44..faf535519b 100644
--- a/invoice.xml
+++ b/invoice.xml
@@ -67,17 +67,12 @@ this repository contains the full copyright notices and license terms. -->
                                         <button name="cancel" string="_Cancel"
                                             icon="tryton-cancel"/>
                                         <button name="draft" string="_Draft"
-                                            type="object"
                                             icon="tryton-go-previous"/>
                                         <button name="proforma" string="Pro For_ma"
-                                            type="object"
                                             icon="tryton-go-next"/>
                                         <button name="open" string="_Open"
-                                            type="object"
                                             icon="tryton-ok"/>
-                                        <button name="%(wizard_pay)d" string="_Pay"
-                                            type="action"
-                                            states="{'invisible': Not(Equal(Eval('state'), 'open')), 'readonly': Not(In(%(account.group_account)d, Eval('groups', [])))}"
+                                        <button name="pay" string="_Pay"
                                             icon="tryton-go-next"/>
                                     </group>
                                 </group>