diff --git a/statement.py b/statement.py
index 78a9788e17..8a4d8de00d 100644
--- a/statement.py
+++ b/statement.py
@@ -260,12 +260,10 @@ class Statement(ModelWorkflow, ModelSQL, ModelView):
                             amount_to_pay - abs(line['amount'])
         return res
 
-    def set_state_validated(self, statement_id):
+    def wkf_validated(self, statement):
         statement_line_obj = Pool().get('account.statement.line')
         lang_obj = Pool().get('ir.lang')
 
-        statement = self.browse(statement_id)
-
         computed_end_balance = statement.start_balance
         for line in statement.lines:
             computed_end_balance += line.amount
@@ -284,25 +282,23 @@ class Statement(ModelWorkflow, ModelSQL, ModelView):
             self.raise_user_error('wrong_end_balance', error_args=(amount,))
         for line in statement.lines:
             statement_line_obj.create_move(line)
-        self.write(statement_id, {
+        self.write(statement.id, {
             'state':'validated',
             })
 
-    def set_state_posted(self, statement_id):
+    def wkf_posted(self, statement):
         statement_line_obj = Pool().get('account.statement.line')
 
-        statement = self.browse(statement_id)
         statement_line_obj.post_move(statement.lines)
-        self.write(statement_id, {
+        self.write(statement.id, {
             'state':'posted',
             })
 
-    def set_state_cancel(self, statement_id):
+    def wkf_cancel(self, statement):
         statement_line_obj = Pool().get('account.statement.line')
 
-        statement = self.browse(statement_id)
         statement_line_obj.delete_move(statement.lines)
-        self.write(statement_id, {
+        self.write(statement.id, {
             'state':'cancel',
             })
 
diff --git a/statement.xml b/statement.xml
index 3e00ef6730..7a0ad34280 100644
--- a/statement.xml
+++ b/statement.xml
@@ -216,21 +216,18 @@ this repository contains the full copyright notices and license terms. -->
         </record>
         <record model="workflow.activity" id="statement_act_validated">
             <field name="workflow" ref="wkf_statement"/>
-            <field name="kind">function</field>
-            <field name="action">set_state_validated()</field>
+            <field name="method">wkf_validated</field>
             <field name="name">Validated</field>
         </record>
         <record model="workflow.activity" id="statement_act_posted">
             <field name="workflow" ref="wkf_statement"/>
-            <field name="kind">function</field>
-            <field name="action">set_state_posted()</field>
+            <field name="method">wkf_posted</field>
             <field name="name">Posted</field>
             <field name="flow_stop" eval="True"/>
         </record>
         <record model="workflow.activity" id="statement_act_cancel">
             <field name="workflow" ref="wkf_statement"/>
-            <field name="kind">function</field>
-            <field name="action">set_state_cancel()</field>
+            <field name="method">wkf_cancel</field>
             <field name="name">Canceled</field>
             <field name="flow_stop" eval="True"/>
         </record>