diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index de9cebdd09b..2046d787ef3 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -820,10 +820,7 @@ class account_voucher(osv.osv):
         return vals
 
     def button_proforma_voucher(self, cr, uid, ids, context=None):
-        context = context or {}
-        wf_service = netsvc.LocalService("workflow")
-        for vid in ids:
-            wf_service.trg_validate(uid, 'account.voucher', vid, 'proforma_voucher', cr)
+        self.signal_proforma_voucher(cr, uid, ids)
         return {'type': 'ir.actions.act_window_close'}
 
     def proforma_voucher(self, cr, uid, ids, context=None):
@@ -1506,7 +1503,6 @@ class account_bank_statement(osv.osv):
 
     def create_move_from_st_line(self, cr, uid, st_line_id, company_currency_id, next_number, context=None):
         voucher_obj = self.pool.get('account.voucher')
-        wf_service = netsvc.LocalService("workflow")
         move_line_obj = self.pool.get('account.move.line')
         bank_st_line_obj = self.pool.get('account.bank.statement.line')
         st_line = bank_st_line_obj.browse(cr, uid, st_line_id, context=context)
@@ -1514,7 +1510,7 @@ class account_bank_statement(osv.osv):
             voucher_obj.write(cr, uid, [st_line.voucher_id.id], {'number': next_number}, context=context)
             if st_line.voucher_id.state == 'cancel':
                 voucher_obj.action_cancel_draft(cr, uid, [st_line.voucher_id.id], context=context)
-            wf_service.trg_validate(uid, 'account.voucher', st_line.voucher_id.id, 'proforma_voucher', cr)
+            voucher_obj.signal_proforma_voucher(cr, uid, [st_line.voucher_id.id])
 
             v = voucher_obj.browse(cr, uid, st_line.voucher_id.id, context=context)
             bank_st_line_obj.write(cr, uid, [st_line_id], {
diff --git a/addons/account_voucher/test/case1_usd_usd.yml b/addons/account_voucher/test/case1_usd_usd.yml
index 0f4c2058fc7..fd1945691ba 100644
--- a/addons/account_voucher/test/case1_usd_usd.yml
+++ b/addons/account_voucher/test/case1_usd_usd.yml
@@ -182,10 +182,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 1 USD/USD'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my first voucher is valid
 -
@@ -279,10 +277,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 1'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my second voucher is valid
 -
diff --git a/addons/account_voucher/test/case2_suppl_usd_eur.yml b/addons/account_voucher/test/case2_suppl_usd_eur.yml
index b32228032d3..91fb99f6360 100644
--- a/addons/account_voucher/test/case2_suppl_usd_eur.yml
+++ b/addons/account_voucher/test/case2_suppl_usd_eur.yml
@@ -161,10 +161,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 2 SUPPL USD/EUR'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my voucher is valid
 -
@@ -266,10 +264,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 2 SUPPL USD/EUR'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that my voucher state is posted
 -
diff --git a/addons/account_voucher/test/case2_usd_eur_debtor_in_eur.yml b/addons/account_voucher/test/case2_usd_eur_debtor_in_eur.yml
index 275e4c58835..2afdc8ad31b 100644
--- a/addons/account_voucher/test/case2_usd_eur_debtor_in_eur.yml
+++ b/addons/account_voucher/test/case2_usd_eur_debtor_in_eur.yml
@@ -181,8 +181,7 @@
   !python {model: account.voucher}: |
     import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 2 USD/EUR DR EUR'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my voucher is valid
 -
@@ -256,8 +255,7 @@
   !python {model: account.voucher}: |
     import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 2 SUPPL USD/EUR DR EUR'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that my voucher state is posted
 -
diff --git a/addons/account_voucher/test/case2_usd_eur_debtor_in_usd.yml b/addons/account_voucher/test/case2_usd_eur_debtor_in_usd.yml
index 667882e3a32..b049fc7692e 100644
--- a/addons/account_voucher/test/case2_usd_eur_debtor_in_usd.yml
+++ b/addons/account_voucher/test/case2_usd_eur_debtor_in_usd.yml
@@ -179,10 +179,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 2 USD/EUR DR USD'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my voucher is valid
 -
@@ -269,10 +267,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 2 SUPPL USD/EUR DR USD'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that my voucher state is posted
 -
diff --git a/addons/account_voucher/test/case3_eur_eur.yml b/addons/account_voucher/test/case3_eur_eur.yml
index f2f9461c31e..d0b18a5231b 100644
--- a/addons/account_voucher/test/case3_eur_eur.yml
+++ b/addons/account_voucher/test/case3_eur_eur.yml
@@ -141,10 +141,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 3'),('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my first voucher is valid
 -
@@ -231,10 +229,8 @@
   I confirm the voucher
 -
   !python {model: account.voucher}: |
-    import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'Second payment: Case 3'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my second voucher is valid
 -
diff --git a/addons/account_voucher/test/case4_cad_chf.yml b/addons/account_voucher/test/case4_cad_chf.yml
index bc33e387a85..e8fe4c8cf9b 100644
--- a/addons/account_voucher/test/case4_cad_chf.yml
+++ b/addons/account_voucher/test/case4_cad_chf.yml
@@ -143,8 +143,7 @@
   !python {model: account.voucher}: |
     import netsvc
     voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 4'), ('partner_id', '=', ref('base.res_partner_19'))])
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher[0], 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, voucher)
 -
   I check that the move of my voucher is valid
 -
diff --git a/addons/account_voucher/test/sales_payment.yml b/addons/account_voucher/test/sales_payment.yml
index b71e42add0b..e7ed61c2cb2 100644
--- a/addons/account_voucher/test/sales_payment.yml
+++ b/addons/account_voucher/test/sales_payment.yml
@@ -61,8 +61,7 @@
     id = self.create(cr, uid, vals)
     voucher_id = self.browse(cr, uid, id)
     assert (voucher_id.state=='draft'), "Voucher is not in draft state"
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher_id.id, 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, [voucher_id.id])
 
 -
   Finally i will Confirm the state of the invoice is paid
diff --git a/addons/account_voucher/test/sales_receipt.yml b/addons/account_voucher/test/sales_receipt.yml
index cf4bc5c46d3..af10777d98a 100644
--- a/addons/account_voucher/test/sales_receipt.yml
+++ b/addons/account_voucher/test/sales_receipt.yml
@@ -65,8 +65,7 @@
     id = self.create(cr, uid, vals)
     voucher_id = self.browse(cr, uid, id)
     assert (voucher_id.state=='draft'), "Voucher is not in draft state"
-    wf_service = netsvc.LocalService("workflow")
-    wf_service.trg_validate(uid, 'account.voucher', voucher_id.id, 'proforma_voucher', cr)
+    self.signal_proforma_voucher(cr, uid, [voucher_id.id])
 -
   I check that move lines are reconciled meaning voucher is paid
 -