=== modified file 'dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/startup/TableAlteror.java'
--- dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/startup/TableAlteror.java	2015-04-20 09:11:27 +0000
+++ dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/startup/TableAlteror.java	2015-04-26 19:37:25 +0000
@@ -810,6 +810,9 @@
         
         executeSql( "update categoryoptioncombo set ignoreapproval = false where ignoreapproval is null" );
 
+        executeSql( "alter table version alter column versionkey set not null" );
+        executeSql( "alter table version add constraint version_versionkey_key unique(versionkey)" );
+
         upgradeDataValuesWithAttributeOptionCombo();
         upgradeCompleteDataSetRegistrationsWithAttributeOptionCombo();
         upgradeMapViewsToAnalyticalObject();