=== modified file 'dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/user/UserGroupDeletionHandler.java'
--- dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/user/UserGroupDeletionHandler.java	2012-07-01 11:33:07 +0000
+++ dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/user/UserGroupDeletionHandler.java	2013-03-22 10:47:34 +0000
@@ -30,6 +30,8 @@
 import java.util.Iterator;
 
 import org.hisp.dhis.system.deletion.DeletionHandler;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
 
 /**
  * @author Lars Helge Overland
@@ -47,6 +49,9 @@
     {
         this.userGroupService = userGroupService;
     }
+    
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
 
     // -------------------------------------------------------------------------
     // DeletionHandler implementation
@@ -58,6 +63,7 @@
         return UserGroup.class.getSimpleName();
     }
 
+    @Override
     public void deleteUser( User user )
     {
         Iterator<UserGroup> iterator = user.getGroups().iterator();
@@ -69,4 +75,12 @@
             userGroupService.updateUserGroup( group );
         }
     }
+    
+    @Override
+    public String allowDeleteUserGroup( UserGroup group )
+    {
+        int count = jdbcTemplate.queryForInt( "select count(*) from usergroupaccess where usergroupid=" + group.getId() );
+        
+        return count == 0 ? null : "";
+    }
 }

=== modified file 'dhis-2/dhis-web/dhis-web-commons/src/main/resources/i18n_global.properties'
--- dhis-2/dhis-web/dhis-web-commons/src/main/resources/i18n_global.properties	2013-03-20 09:35:04 +0000
+++ dhis-2/dhis-web/dhis-web-commons/src/main/resources/i18n_global.properties	2013-03-22 10:47:34 +0000
@@ -160,6 +160,7 @@
 code_from_email=Code from email
 password_hint=Minimum 8 characters, 1 upper-case and 1 digit
 optional=Optional
+object_not_deleted_associated_by_objects=Object was not deleted because it is used by other objects:
 
 #-- PeriodTypes ----------------------------------------------------------------#