=== modified file 'dhis-2/dhis-web/dhis-web-api/src/main/java/org/hisp/dhis/webapi/controller/AbstractCrudController.java'
--- dhis-2/dhis-web/dhis-web-api/src/main/java/org/hisp/dhis/webapi/controller/AbstractCrudController.java	2014-12-08 15:40:55 +0000
+++ dhis-2/dhis-web/dhis-web-api/src/main/java/org/hisp/dhis/webapi/controller/AbstractCrudController.java	2014-12-11 14:10:11 +0000
@@ -573,6 +573,7 @@
         // if it already contains this object, don't add it. It might be a list and not set, and we don't want duplicates.
         if ( identifiableObjects.contains( candidate ) )
         {
+            response.setStatus( HttpServletResponse.SC_NO_CONTENT );
             return; // nothing to do, just return with OK
         }