Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 18966)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 18967)
@@ -157,4 +157,8 @@
     private final CancelAction cancelAction;
     /**
+     * Action for performing the {@link DeleteCurrentRelationAction}
+     */
+    private final DeleteCurrentRelationAction deleteAction;
+    /**
      * A list of listeners that need to be notified on clipboard content changes.
      */
@@ -266,5 +270,5 @@
         final DuplicateRelationAction duplicateAction = new DuplicateRelationAction(actionAccess);
         // Action for performing the {@link DeleteCurrentRelationAction}
-        final DeleteCurrentRelationAction deleteAction = new DeleteCurrentRelationAction(actionAccess);
+        deleteAction = new DeleteCurrentRelationAction(actionAccess);
 
         this.memberTableModel.addTableModelListener(applyAction);
@@ -406,4 +410,5 @@
      * builds the panel with the OK and the Cancel button
      * @param okAction OK action
+     * @param deleteAction Delete action
      * @param cancelAction Cancel action
      *
@@ -1077,4 +1082,5 @@
     @Override
     public void commandChanged(int queueSize, int redoSize) {
+        deleteAction.updateEnabledState();
         Relation r = getRelation();
         if (r != null && r.getDataSet() == null) {
Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/DeleteCurrentRelationAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/DeleteCurrentRelationAction.java	(revision 18966)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/DeleteCurrentRelationAction.java	(revision 18967)
@@ -40,6 +40,7 @@
 
     @Override
-    protected void updateEnabledState() {
-        setEnabled(getEditor().getRelationSnapshot() != null);
+    public void updateEnabledState() {
+        Relation r = getEditor().getRelation();
+        setEnabled(r != null && !r.isDeleted());
     }