Proxy role is needed to access the site message context.

bt5/erp5_crm/SkinTemplateItem/portal_skins/erp5_crm/SiteMessage_acknowledge.xml

@@ -86,6 +86,14 @@ return result\n
             <key> <string>_params</string> </key>
             <value> <string>user_name=None, **kw</string> </value>
         </item>
+        <item>
+            <key> <string>_proxy_roles</string> </key>
+            <value>
+              <tuple>
+                <string>Manager</string>
+              </tuple>
+            </value>
+        </item>
         <item>
             <key> <string>id</string> </key>
             <value> <string>SiteMessage_acknowledge</string> </value>

bt5/erp5_crm/bt/revision

-597
+598
\ No newline at end of file