diff --git a/bt5/erp5_crm/WorkflowTemplateItem/portal_workflow/event_workflow/scripts/Event_checkConsistencyForAcknowledge.xml b/bt5/erp5_crm/WorkflowTemplateItem/portal_workflow/event_workflow/scripts/Event_checkConsistencyForAcknowledge.xml
index def6c0312b9cf7abb2ac2571443d1f303265c117..7b2120832bc22fd68fa61517d31812b20ba48ea0 100644
--- a/bt5/erp5_crm/WorkflowTemplateItem/portal_workflow/event_workflow/scripts/Event_checkConsistencyForAcknowledge.xml
+++ b/bt5/erp5_crm/WorkflowTemplateItem/portal_workflow/event_workflow/scripts/Event_checkConsistencyForAcknowledge.xml
@@ -58,7 +58,22 @@ from Products.ERP5Type.Message import translateString\n
 \n
 container.Event_checkConsistency(sci)\n
 \n
+portal = sci.getPortal()\n
+portal_workflow = portal.portal_workflow\n
 event = sci[\'object\']\n
+\n
+follow_up_ticket_type = portal_workflow.getInfoFor(event,\n
+                                                   \'follow_up_ticket_type\',\n
+                                                   wf_id=\'event_workflow\')\n
+\n
+follow_up_ticket_title = portal_workflow.getInfoFor(event,\n
+                                                    \'follow_up_ticket_title\',\n
+                                                    wf_id=\'event_workflow\')\n
+\n
+if follow_up_ticket_type not in ["", None] and \\\n
+     follow_up_ticket_title not in ["", None]:\n
+  return \n
+\n
 if not event.getFollowUp():\n
   raise ValidationFailed(translateString(\'Follow up must be set to acknowledge an Event.\'))\n
 </string> </value>
@@ -104,8 +119,13 @@ if not event.getFollowUp():\n
                             <string>translateString</string>
                             <string>_getattr_</string>
                             <string>container</string>
+                            <string>portal</string>
+                            <string>portal_workflow</string>
                             <string>_getitem_</string>
                             <string>event</string>
+                            <string>follow_up_ticket_type</string>
+                            <string>follow_up_ticket_title</string>
+                            <string>None</string>
                           </tuple>
                         </value>
                     </item>
diff --git a/bt5/erp5_crm/bt/revision b/bt5/erp5_crm/bt/revision
index 662d98cc9235552d5e3cd90c5ffc1983edf4bf2e..3fa694f2455f39f033c48543cf4f6fed6f637488 100644
--- a/bt5/erp5_crm/bt/revision
+++ b/bt5/erp5_crm/bt/revision
@@ -1 +1 @@
-436
\ No newline at end of file
+437
\ No newline at end of file