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diff --git a/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/StatementChangeImpl.java b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/StatementChangeImpl.java
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index 000000000..ce5a94a3f
--- /dev/null
+++ b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/StatementChangeImpl.java
@@ -0,0 +1,100 @@
+/*******************************************************************************
+ * 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 fi.vtt.simantics.procore.internal;
+
+import org.simantics.db.ChangeSet.StatementChange;
+import org.simantics.db.Resource;
+
+/**
+ * Intentionally implements hashCode and equals so that the {@link #claim}
+ * field is not counted as an ID of this instance.
+ * 
+ * @author Tuukka Lehtonen
+ */
+final class StatementChangeImpl implements StatementChange {
+
+    private final Resource s;
+    private final Resource p;
+    private final Resource o;
+
+    /**
+     * Intentionally left package-modifiable through {@link #setClaim(boolean)}
+     * as an implementation-internal optimization by allowing reuse of the same
+     * StatementChangeImpl instance.
+     */
+    private boolean claim;
+
+    public StatementChangeImpl(final SessionImplSocket session, final int s, final int p, final int o, boolean claim) {
+        this.s = session.getResource(s);
+        this.p = session.getResource(p);
+        this.o = session.getResource(o);
+        this.claim = claim;
+    }
+    public StatementChangeImpl(final Resource s, final Resource p, final Resource o, boolean claim) {
+        this.s = s;
+        this.p = p;
+        this.o = o;
+        this.claim = claim;
+    }
+
+    @Override
+    public Resource getObject() {
+        return o;
+    }
+
+    @Override
+    final public Resource getPredicate() {
+        return p;
+    }
+
+    @Override
+    final public Resource getSubject() {
+        return s;
+    }
+
+    void setClaim(boolean claim) {
+        this.claim = claim;
+    }
+
+    public boolean isClaim() {
+        return claim;
+    }
+
+    @Override
+    public boolean isAsserted(Resource testSubject) {
+    	return !s.equals(testSubject);
+    }
+
+    @Override
+    public int hashCode() {
+        return hashCode(s, p, o);
+    }
+    
+    public static int hashCode(Resource s, Resource p, Resource o) {
+        return 41 * ( 31 * s.hashCode() + p.hashCode()) + o.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (this == object)
+            return true;
+        else if (object == null)
+            return false;
+        else if (StatementChangeImpl.class != object.getClass())
+            return false;
+        StatementChangeImpl r = (StatementChangeImpl) object;
+        return getSubject().equals(r.getSubject())
+        && getPredicate().equals(r.getPredicate())
+        && getObject().equals(r.getObject());
+    }
+}
+