diff --git a/purchase.py b/purchase.py
index 3cdb6f494c..5a78ea7169 100644
--- a/purchase.py
+++ b/purchase.py
@@ -8,7 +8,7 @@ from trytond.modules.company import CompanyReport
 from trytond.wizard import Wizard, StateAction, StateView, StateTransition, \
     Button
 from trytond.backend import TableHandler
-from trytond.pyson import Eval, Bool, If, PYSONEncoder
+from trytond.pyson import Eval, Bool, If, PYSONEncoder, Id
 from trytond.transaction import Transaction
 from trytond.pool import Pool
 from trytond.config import CONFIG
@@ -164,6 +164,18 @@ class Purchase(Workflow, ModelSQL, ModelView):
                 'confirm': {
                     'invisible': Eval('state') != 'quotation',
                     },
+                'handle_invoice_exception': {
+                    'invisible': ((Eval('invoice_state') != 'exception')
+                        | (Eval('state') == 'cancel')),
+                    'readonly': ~Eval('groups', []).contains(
+                        Id('purchase', 'group_purchase')),
+                    },
+                'handle_shipment_exception': {
+                    'invisible': ((Eval('shipment_state') != 'exception')
+                        | (Eval('state') == 'cancel')),
+                    'readonly': ~Eval('groups', []).contains(
+                        Id('purchase', 'group_purchase')),
+                    },
                 })
         # The states where amounts are cached
         self._states_cached = ['confirmed', 'done', 'cancel']
@@ -778,6 +790,14 @@ class Purchase(Workflow, ModelSQL, ModelView):
         self.store_cache(ids)
         self.process(ids)
 
+    @ModelView.button_action('purchase.wizard_invoice_handle_exception')
+    def handle_invoice_exception(self, ids):
+        pass
+
+    @ModelView.button_action('purchase.wizard_shipment_handle_exception')
+    def handle_shipment_exception(self, ids):
+        pass
+
     def process(self, ids):
         done = []
         for purchase in self.browse(ids):
diff --git a/purchase.xml b/purchase.xml
index e32007a82e..692233d2b7 100644
--- a/purchase.xml
+++ b/purchase.xml
@@ -99,22 +99,18 @@ this repository contains the full copyright notices and license terms. -->
                                 <label name="total_amount" xalign="1.0" xexpand="1"/>
                                 <field name="total_amount" xalign="1.0" xexpand="0"/>
                                 <group col="6" colspan="2" id="buttons">
-                                    <button name="cancel" type="object" string="Cancel"
+                                    <button name="cancel" string="Cancel"
                                         icon="tryton-cancel"/>
-                                    <button name="draft" type="object" string="Draft"/>
-                                    <button name="quote" type="object" string="Quote"
+                                    <button name="draft" string="Draft"/>
+                                    <button name="quote" string="Quote"
                                         icon="tryton-go-next"/>
-                                    <button name="%(wizard_invoice_handle_exception)d"
+                                    <button name="handle_invoice_exception"
                                             string="Handle Invoice Exception"
-                                            type="action"
-                                            states="{'invisible': Or(Not(Equal(Eval('invoice_state'), 'exception')), Equal(Eval('state'), 'cancel')), 'readonly': Not(In(%(group_purchase)d, Eval('groups', [])))}"
                                             icon="tryton-go-next"/>
-                                    <button name="%(wizard_shipment_handle_exception)d"
+                                    <button name="handle_shipment_exception"
                                             string="Handle Shipment Exception"
-                                            type="action"
-                                            states="{'invisible': Or(Not(Equal(Eval('shipment_state'), 'exception')), Equal(Eval('state'), 'cancel')), 'readonly': Not(In(%(group_purchase)d, Eval('groups', [])))}"
                                             icon="tryton-go-next"/>
-                                    <button name="confirm" type="object" string="Confirm"
+                                    <button name="confirm" string="Confirm"
                                         icon="tryton-ok"/>
                                 </group>
                             </group>