diff --git a/product/ERP5/Tool/AcknowledgementTool.py b/product/ERP5/Tool/AcknowledgementTool.py
index 9030ac5aee5d076569d03df14b1182945eab2c16..c5960b8685e03254d3b800c39b2d7d4c3791d0e9 100644
--- a/product/ERP5/Tool/AcknowledgementTool.py
+++ b/product/ERP5/Tool/AcknowledgementTool.py
@@ -70,6 +70,13 @@ class AcknowledgementTool(BaseTool):
     """
     return len(self.getUnreadAcknowledgementList(*args, **kw))
 
+  def _getAcknowledgementTypeList(self):
+    """
+    Return list of acknowledgement types, should use portal types group
+    when we see need of having several portal types for acknowledgements
+    """
+    return ('Acknowledgement',)
+
   security.declarePublic('getUnreadAcknowledgementList')
   def getUnreadAcknowledgementList(self, portal_type=None, user_name=None,
                                    url_list=None):
@@ -131,7 +138,7 @@ class AcknowledgementTool(BaseTool):
         # so not in a final state
         final_state_list = self.getPortalCurrentInventoryStateList()
         query = NegatedQuery(Query(simulation_state=final_state_list))
-        for x in self.portal_catalog(portal_type = portal_type,
+        for x in self.portal_catalog(portal_type = self._getAcknowledgementTypeList(),
                 query=query,
 #               start_date = {'query':now,'range':'max'},
 #               stop_date = {'query':now,'range':'min'},
diff --git a/product/ERP5/tests/testAcknowledgementTool.py b/product/ERP5/tests/testAcknowledgementTool.py
index 6817a29e0acfb860ef1f14b689cd62e1d8133cad..eb234200942a1167d022fbc443f8bedb113f71bd 100644
--- a/product/ERP5/tests/testAcknowledgementTool.py
+++ b/product/ERP5/tests/testAcknowledgementTool.py
@@ -60,13 +60,20 @@ class TestAcknowledgementTool(ERP5TypeTestCase):
                title="foo",
                start_date = now-2,
                stop_date = now+2)
-    portal.portal_workflow.doActionFor(event, 'start_action')
-    self.assertEqual(event.getSimulationState(), 'started')
     self.tic()
 
     acknowledgement_tool_kw = {}
     acknowledgement_tool_kw['user_name'] = 'seb'
     acknowledgement_tool_kw['portal_type'] = event_type
+    # draft document must be not be part of acknowledgements
+    document_url_list = portal.portal_acknowledgements\
+                         .getUnreadDocumentUrlList(**acknowledgement_tool_kw)
+    self.assertFalse(event.getRelativeUrl() in document_url_list)
+
+    # validated document must be part of acknowledgements
+    portal.portal_workflow.doActionFor(event, 'start_action')
+    self.assertEqual(event.getSimulationState(), 'started')
+    self.tic()
     document_url_list = portal.portal_acknowledgements\
                          .getUnreadDocumentUrlList(**acknowledgement_tool_kw)
     self.assertTrue(event.getRelativeUrl() in document_url_list)