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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/OrderedSetToListMigrationStep.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/OrderedSetToListMigrationStep.java
new file mode 100644
index 000000000..b7180b7a0
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/OrderedSetToListMigrationStep.java
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright (c) 2012 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.layer0.migration;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.simantics.databoard.Bindings;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.request.PossibleObjectWithType;
+import org.simantics.db.common.request.WriteRequest;
+import org.simantics.db.common.utils.ListUtils;
+import org.simantics.db.common.utils.OrderedSetUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.Instances;
+import org.simantics.layer0.Layer0;
+
+public class OrderedSetToListMigrationStep implements MigrationStep {
+    
+    final ArrayList<OrderedSetToListMapping> rules;
+    
+    private class OrderedSetToListMapping {
+        public Resource entityType, orderedSet, orderedSetRelation, list, listRelation;
+    }
+    
+    public OrderedSetToListMigrationStep(ReadGraph graph, Resource step) throws DatabaseException {
+        rules = new ArrayList<OrderedSetToListMapping>();
+        Layer0 L0 = Layer0.getInstance(graph);
+        for(Resource change : ListUtils.toList(graph, step)) {
+            String entityType = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_entityType, Bindings.STRING);
+            String orderedSet = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_orderedSetType, Bindings.STRING);
+            String orderedSetRelation = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_orderedSetRelation, Bindings.STRING);
+            String list = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_listType, Bindings.STRING);
+            String listRelation = graph.getPossibleRelatedValue(change, L0.OrderedSetToListMigrationStep_listRelation, Bindings.STRING);
+            
+            if(orderedSet != null && orderedSetRelation != null && list != null && listRelation != null) {
+                OrderedSetToListMapping mapping = new OrderedSetToListMapping();
+                mapping.entityType = graph.getResource(entityType);
+                mapping.orderedSet = graph.getResource(orderedSet);
+                mapping.orderedSetRelation = graph.getResource(orderedSetRelation);
+                mapping.list = graph.getResource(list);
+                mapping.listRelation = graph.getResource(listRelation);
+                rules.add(mapping);
+            }
+        }
+    }
+
+    @Override
+    public void applyTo(IProgressMonitor monitor, Session session, MigrationState state) throws DatabaseException {
+        final Resource resource = MigrationUtils.getResource(monitor, session, state);
+        
+        if(resource != null) {
+            session.syncRequest(new WriteRequest() {
+                
+                @Override
+                public void perform(WriteGraph graph) throws DatabaseException {
+                    for(OrderedSetToListMapping mapping : rules) {
+                        Instances entityFinder = graph.adapt(mapping.entityType, Instances.class);
+                        for(Resource entity : entityFinder.find(graph, resource)) {
+                            Resource orderedSet = graph.syncRequest(new PossibleObjectWithType(entity, mapping.orderedSetRelation, mapping.orderedSet));
+                            if(orderedSet != null) {
+                                Collection<Resource> list = OrderedSetUtils.toList(graph, orderedSet);
+                                graph.deny(entity, mapping.orderedSetRelation, orderedSet);
+                                graph.claim(entity, mapping.listRelation, ListUtils.create(graph, mapping.list, list));
+                            }
+                        }
+
+                    }                    
+                }
+            });
+        }
+        
+    }
+
+
+}