diff --git a/org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/MarkerService.java b/org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/MarkerService.java
index bfaf74fd5e2a343d069cc4d8cd8d51ef8eed4104..29be8909dac5320fb336f69bf20733020ee4ad88 100644
--- a/org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/MarkerService.java
+++ b/org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/MarkerService.java
@@ -17,6 +17,8 @@ $Id$
 +--------------------------------------------------------------------------*/
 package org.fortiss.tooling.kernel.ui.internal;
 
+import static org.fortiss.tooling.kernel.utils.EcoreUtils.postRefreshNotification;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -31,8 +33,6 @@ import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
-import org.eclipse.emf.common.notify.Notification;
-import org.eclipse.emf.common.notify.impl.NotificationImpl;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.viewers.IDecoration;
@@ -57,7 +57,7 @@ import org.fortiss.tooling.kernel.ui.service.IMarkerService;
  * @author hoelzl
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating RED Hash: A2A864DADACAF09ABE26E40754307016
+ * @ConQAT.Rating YELLOW Hash: 17A1ACFF311CC8EBE383929A19604E0C
  */
 public class MarkerService implements IMarkerService,
 		IPersistencyServiceListener, ILightweightLabelDecorator {
@@ -291,21 +291,16 @@ public class MarkerService implements IMarkerService,
 		/** Stores the top-level element. */
 		private ITopLevelElement topElement;
 
-		// TODO @Review CD: magic number AND totally incomprehensible
-		/** Notification to cause model element display refresh. */
-		private Notification refreshOnly = new NotificationImpl(
-				Notification.EVENT_TYPE_COUNT + 256, null, null);
-
 		/** Stores the display update UI job. */
 		private final UIJob refreshElementDisplay = new UIJob("Update Markers") {
 
 			@Override
 			public IStatus runInUIThread(IProgressMonitor monitor) {
 				for (EObject eo : violationsMap.keySet()) {
-					eo.eNotify(refreshOnly);
+					postRefreshNotification(eo);
 					for (IConstraintViolation<? extends EObject> viol : violationsMap
 							.get(eo)) {
-						viol.getSource().eNotify(refreshOnly);
+						postRefreshNotification(viol.getSource());
 					}
 				}
 				return Status.OK_STATUS;
diff --git a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EcoreUtils.java b/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EcoreUtils.java
index bdd4c03498344ac805700234f3227fd187d93303..dc9a5f0e43997721ad0265ef4208fb7ffa311628 100644
--- a/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EcoreUtils.java
+++ b/org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EcoreUtils.java
@@ -17,9 +17,13 @@ $Id: codetemplates.xml 1 2011-01-01 00:00:01Z hoelzl $
 +--------------------------------------------------------------------------*/
 package org.fortiss.tooling.kernel.utils;
 
+import static org.eclipse.emf.common.notify.Notification.EVENT_TYPE_COUNT;
+
 import java.util.Collection;
 import java.util.List;
 
+import org.eclipse.emf.common.notify.Notification;
+import org.eclipse.emf.common.notify.impl.NotificationImpl;
 import org.eclipse.emf.common.util.BasicEList;
 import org.eclipse.emf.common.util.ECollections;
 import org.eclipse.emf.common.util.EList;
@@ -34,10 +38,19 @@ import org.eclipse.emf.ecore.util.EcoreUtil;
  * @author ratiu
  * @author $Author: hoelzl $
  * @version $Rev: 18709 $
- * @ConQAT.Rating YELLOW Hash: 85264FC59A1B469EBEBF06B27CCDF9B5
+ * @ConQAT.Rating YELLOW Hash: D2EE43270D816D9D45663D29F23C739F
  */
 public class EcoreUtils {
 
+	/** The new event type count defined by the kernel. */
+	public static final int KERNEL_EMF_EVENT_TYPE_COUNT = EVENT_TYPE_COUNT + 1;
+
+	/** Notification to cause model element display refresh. */
+	// we use a large number above EMF standard notifications to avoid collision
+	// with other EMF tools.
+	private static final Notification refreshNotification = new NotificationImpl(
+			EVENT_TYPE_COUNT + 1, null, null);
+
 	/**
 	 * Converts an EList of a given type into an EList of one of its subtypes.
 	 * Utility method to avoid unnecessary casts.
@@ -154,4 +167,15 @@ public class EcoreUtils {
 		}
 		return children;
 	}
+
+	/**
+	 * Posts a {@link Notification} with an event type ID outside the EMF
+	 * default notification IDs to cause UI refreshes.
+	 * 
+	 * @param eObject
+	 *            the target model element to be refreshed
+	 */
+	public static void postRefreshNotification(EObject eObject) {
+		eObject.eNotify(refreshNotification);
+	}
 }