=== 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	2011-08-04 12:29:20 +0000
+++ dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/startup/TableAlteror.java	2011-09-16 04:30:16 +0000
@@ -196,7 +196,7 @@
         }
         
         // update periodType field to ValidationRule
-        executeSql( "UPDATE validationrule SET periodtypeid = (SELECT periodtypeid FROM periodtype WHERE name='Monthly')" );
+        executeSql( "UPDATE validationrule SET periodtypeid = (SELECT periodtypeid FROM periodtype WHERE name='Monthly') WHERE periodtypeid is null" );
 
         // update dataelement.domainTypes of which values is null
         executeSql( "UPDATE dataelement SET domaintype='aggregate' WHERE domaintype is null" );