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diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ConnectionRelationRemover.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ConnectionRelationRemover.java
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+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ConnectionRelationRemover.java
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+/*******************************************************************************
+ * 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.modeling.adapters;
+
+import java.util.Collection;
+import java.util.Map;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.utils.OrderedSetUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.impl.AbstractRemover;
+import org.simantics.db.layer0.util.RemoverUtil;
+import org.simantics.diagram.stubs.DiagramResource;
+import org.simantics.layer0.Layer0;
+import org.simantics.modeling.ModelingResources;
+import org.simantics.modeling.adapters.Removers.ValidationResult;
+
+/**
+ * @author Tuukka Lehtonen
+ * @see TerminalRemover
+ */
+public class ConnectionRelationRemover extends AbstractRemover {
+
+    public ConnectionRelationRemover(Resource connectionRelation) {
+        super(connectionRelation);
+    }
+
+    @Override
+    public String canRemove(ReadGraph graph, Map<Object, Object> aux) throws DatabaseException {
+        ModelingResources MOD = ModelingResources.getInstance(graph);
+        Resource diagramConnectionRelation = null;
+        Resource connectionRelation = graph.getPossibleObject(resource, MOD.DiagramConnectionRelationToConnectionRelation);
+        if (connectionRelation != null)
+            diagramConnectionRelation = resource;
+        else
+            connectionRelation = resource;
+        ValidationResult result = Removers.validateConnectionRelationRemoval(graph, connectionRelation, diagramConnectionRelation);
+        if (result.inUse())
+            return Removers.formatError(graph, result);
+        return null;
+    }
+
+    @Override
+    public void remove(WriteGraph graph) throws DatabaseException {
+        Layer0 L0 = Layer0.getInstance(graph);
+        DiagramResource DIA = DiagramResource.getInstance(graph);
+        ModelingResources MOD = ModelingResources.getInstance(graph);
+
+        Collection<Resource> lifts = graph.getObjects(resource, DIA.Lifts);
+
+        // Not necessary, this is legacy support only.
+        for (Resource def : graph.getObjects(resource, L0.ConcernsRelation_Inverse))
+            graph.deny(def);
+
+        // Remove possible symbol terminal(s).
+        for (Resource diagramConnectionRelation : graph.getObjects(resource, MOD.ConnectionRelationToDiagramConnectionRelation)) {
+            removeTerminals(graph, DIA, diagramConnectionRelation);
+            Resource diagramConnectionRelationInverse = graph.getPossibleObject(diagramConnectionRelation, L0.InverseOf);
+            graph.deny(diagramConnectionRelation);
+            if (diagramConnectionRelationInverse != null)
+                graph.deny(diagramConnectionRelationInverse);
+        }
+        removeTerminals(graph, DIA, resource);
+
+        Resource connectionRelationInverse = graph.getPossibleObject(resource, L0.InverseOf);
+        graph.deny(resource);
+        if (connectionRelationInverse != null)
+            graph.deny(connectionRelationInverse);
+
+        if (!lifts.isEmpty())
+            for (Resource lift : lifts)
+                RemoverUtil.remove(graph, lift);
+    }
+    
+    private void removeTerminals(WriteGraph graph, DiagramResource DIA, Resource diagramConnectionRelation) throws DatabaseException {
+        for (Resource terminal : graph.getObjects(diagramConnectionRelation, DIA.HasConnectionPoint_Inverse)) {
+            for (Resource ownerList : OrderedSetUtils.getOwnerLists(graph, terminal, DIA.Composite)) {
+                OrderedSetUtils.remove(graph, ownerList, terminal);
+            }
+            RemoverUtil.remove(graph, terminal);
+        }
+    }
+
+}