Index: trunk/src/org/openstreetmap/josm/gui/conflict/tags/CombinePrimitiveResolverDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/conflict/tags/CombinePrimitiveResolverDialog.java	(revision 2103)
+++ trunk/src/org/openstreetmap/josm/gui/conflict/tags/CombinePrimitiveResolverDialog.java	(revision 2104)
@@ -28,4 +28,5 @@
 import org.openstreetmap.josm.data.osm.Node;
 import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Tag;
 import org.openstreetmap.josm.data.osm.TagCollection;
 import org.openstreetmap.josm.data.osm.Way;
@@ -189,4 +190,7 @@
             cmds.addAll(buildTagChangeCommand(targetPrimitive, tc));
         }
+        if (targetPrimitive.get("created_by") != null) {
+            cmds.add(new ChangePropertyCommand(targetPrimitive, "created_by", null));
+        }
 
         if (getRelationMemberConflictResolverModel().getNumDecisions() >0) {