Index: applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/AssociatedStreetFixer.java
===================================================================
--- applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/AssociatedStreetFixer.java	(revision 33706)
+++ applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/AssociatedStreetFixer.java	(revision 33708)
@@ -17,4 +17,5 @@
 import org.openstreetmap.josm.data.osm.RelationMember;
 import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.gui.MainApplication;
 
 public class AssociatedStreetFixer extends RelationFixer {
@@ -134,5 +135,5 @@
         List<Command> commandList = new ArrayList<>();
         if (fixed) {
-            commandList.add(new ChangeCommand(source, rel));
+            commandList.add(new ChangeCommand(MainApplication.getLayerManager().getEditDataSet(), source, rel));
         }
 
@@ -150,5 +151,5 @@
                 newWay.put("name", commonName);
 
-                commandList.add(new ChangeCommand(oldWay, newWay));
+                commandList.add(new ChangeCommand(MainApplication.getLayerManager().getEditDataSet(), oldWay, newWay));
             }
          */
Index: applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/BoundaryFixer.java
===================================================================
--- applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/BoundaryFixer.java	(revision 33706)
+++ applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/BoundaryFixer.java	(revision 33708)
@@ -10,4 +10,5 @@
 import org.openstreetmap.josm.data.osm.Relation;
 import org.openstreetmap.josm.data.osm.RelationMember;
+import org.openstreetmap.josm.gui.MainApplication;
 
 
@@ -65,5 +66,5 @@
             r = rr;
         }
-        return fixed ? new ChangeCommand(rel, r) : null;
+        return fixed ? new ChangeCommand(MainApplication.getLayerManager().getEditDataSet(), rel, r) : null;
     }
 
Index: applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/PublicTransportFixer.java
===================================================================
--- applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/PublicTransportFixer.java	(revision 33706)
+++ applications/editors/josm/plugins/reltoolbox/src/relcontext/relationfix/PublicTransportFixer.java	(revision 33708)
@@ -9,4 +9,5 @@
 import org.openstreetmap.josm.data.osm.Relation;
 import org.openstreetmap.josm.data.osm.RelationMember;
+import org.openstreetmap.josm.gui.MainApplication;
 
 import relcontext.actions.PublicTransportHelper;
@@ -63,5 +64,5 @@
             r = rr;
         }
-        return fixed ? new ChangeCommand(rel, r) : null;
+        return fixed ? new ChangeCommand(MainApplication.getLayerManager().getEditDataSet(), rel, r) : null;
     }