Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 15769)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 15770)
@@ -862,5 +862,5 @@
                 msg,
                 tr("Multiple members referring to same object."),
-                JOptionPane.YES_NO_OPTION,
+                JOptionPane.YES_NO_CANCEL_OPTION,
                 JOptionPane.WARNING_MESSAGE,
                 null,