Index: utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/UnGlueRelationAction.java
===================================================================
--- utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/UnGlueRelationAction.java	(revision 29390)
+++ utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/actions/UnGlueRelationAction.java	(working copy)
@@ -116,9 +116,10 @@
                 }
             }
             relation.setMembers(newrms);
+            relation.setModified(true);
             return true;
         }
-        
+
         @Override
         public boolean executeCommand() {
             return replaceMembers(oldMember, newMember);