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diff --git a/bundles/org.simantics.mapping/src/org/simantics/mapping/rule/instructions/DenyRuleInstruction.java b/bundles/org.simantics.mapping/src/org/simantics/mapping/rule/instructions/DenyRuleInstruction.java
new file mode 100644
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+++ b/bundles/org.simantics.mapping/src/org/simantics/mapping/rule/instructions/DenyRuleInstruction.java
@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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.mapping.rule.instructions;
+
+import gnu.trove.map.hash.TIntIntHashMap;
+import gnu.trove.set.hash.TIntHashSet;
+
+import java.util.Arrays;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.utils.triggers.IModification;
+import org.simantics.mapping.IContextualModification;
+import org.simantics.mapping.constraint.instructions.IInstruction;
+
+public class DenyRuleInstruction implements IRuleInstruction {
+
+	IInstruction instruction;	
+	
+	public DenyRuleInstruction(IInstruction instruction) {
+		this.instruction = instruction;
+	}
+	
+	@Override
+	public IModification execute(ReadGraph g, Object[] bindings) throws DatabaseException {
+		final IContextualModification modi = instruction.deny(g, bindings); 
+		if(modi != null) {
+			final Object[] curBindings = Arrays.copyOf(bindings, bindings.length);
+			return new IModification() {
+
+				@Override
+				public void perform(WriteGraph g) throws DatabaseException {
+					modi.perform(g, curBindings);
+				}
+				
+			};
+		}
+		return null;
+	}
+	
+	@Override
+	public void doExecute(WriteGraph g, Object[] bindings) throws DatabaseException {
+		instruction.doDeny(g, bindings);
+	}
+
+	@Override
+	public void collectVariables(TIntHashSet reads, TIntHashSet writes) {
+		instruction.collectVariables(reads, writes);
+	}
+
+	@Override
+	public void mapVariables(TIntIntHashMap map) {
+		instruction.mapVariables(map);
+	}
+	
+	@Override
+	public void toString(StringBuilder b, int indent) {		
+		b.append("deny ");
+		instruction.toString(b, indent+1);	
+	}
+}