Index: trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java	(revision 17342)
+++ trunk/src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java	(revision 17343)
@@ -416,5 +416,5 @@
                     if (!values.containsKey(key)) { //relation values take precedence
                         values.put(key, way.get(key));
-                    } else if (!relation.hasKey(key) && !values.get(key).equals(way.get(key))) {
+                    } else if (!values.get(key).equals(way.get(key))) {
                         conflictingKeys.add(key);
                     }