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diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java
new file mode 100644
index 000000000..91a164781
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+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectAccessor.java
@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2013 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.objmap.graph.rules.domain;
+
+import org.apache.log4j.Logger;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.objmap.exceptions.MappingException;
+
+/**
+ * Accesses a resource attached to the element by given functional relation.
+ * @author Hannu Niemistö
+ */
+public class RelatedObjectAccessor implements IDomainAccessor<Resource,Resource> {
+
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
+    
+	Resource relation;
+	
+	public RelatedObjectAccessor(Resource relation) {
+		this.relation = relation;
+	}
+
+	@Override
+	public Resource get(ReadGraph g, Resource element) throws MappingException {
+		try {
+		    LOGGER.info("        RelatedObjectAccessor.get");
+			return g.getPossibleObject(element, relation);
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+	}
+	
+	@Override
+	public boolean set(WriteGraph g, Resource element, Resource value)
+			throws MappingException {
+		try {
+		    LOGGER.info("        RelatedObjectAccessor.set");
+		    Resource resource = g.getPossibleObject(element, relation);
+			if(resource == null) {
+			    if(value == null)
+			        return false;
+			    g.claim(element, relation, value);
+			    return true;
+			}
+			else if(resource.equals(value))
+			    return false;
+			else {
+			    g.deny(element, relation);
+			    if(value != null)
+			        g.claim(element, relation, value);
+			    return true;
+			}
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+		
+	}
+
+}