=== modified file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/filter/AggregatableDataElementFilter.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/filter/AggregatableDataElementFilter.java	2014-10-16 06:17:19 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/filter/AggregatableDataElementFilter.java	2015-01-15 14:48:27 +0000
@@ -49,6 +49,7 @@
         types = new HashSet<>();
         types.add( DataElement.VALUE_TYPE_BOOL );
         types.add( DataElement.VALUE_TYPE_INT );
+        types.add( DataElement.VALUE_TYPE_STRING );
     }
 
     @Override