Index: applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/ChangePropertyKeyCommand.java
===================================================================
--- applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/ChangePropertyKeyCommand.java	(revision 7739)
+++ applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/ChangePropertyKeyCommand.java	(revision 7804)
@@ -48,6 +48,6 @@
 	}
 	
-	@Override public void executeCommand() {
-		super.executeCommand(); // save old
+	@Override public boolean executeCommand() {
+		if (!super.executeCommand()) return false; // save old
 		for (OsmPrimitive osm : objects) {
 			if(osm.keys != null) 
@@ -57,4 +57,5 @@
 			}
 		}
+        return true;
 	}