Manually creating Acknowledgement from UI is meaningless

Acknowledgement can not be displayed without more informations.

bt5/erp5_crm/PortalTypeHiddenContentTypeTemplateItem/hidden_content_type_list.xml

@@ -12,4 +12,7 @@
  <portal_type id="Preference">
   <item>Support Request</item>
  </portal_type>
-</hidden_content_type_list>
\ No newline at end of file
+ <portal_type id="Event Module">
+  <item>Acknowledgement</item>
+ </portal_type>
+</hidden_content_type_list>

bt5/erp5_crm/bt/template_portal_type_hidden_content_type_list

@@ -2,4 +2,4 @@ Campaign | Event Path
 Campaign | Outcome Path
 Event Module | Acknowledgement
 Meeting | Event Path
-Preference | Support Request
\ No newline at end of file
+Preference | Support Request