Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs
===================================================================
diff -u -rfcd32c8e949b4581cc20adcaa7cf7639fcb69d20 -refee294afd668a5b67ffab0df11feeb46e03b147
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs)	(revision fcd32c8e949b4581cc20adcaa7cf7639fcb69d20)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs)	(revision efee294afd668a5b67ffab0df11feeb46e03b147)
@@ -54,12 +54,13 @@
             var affectedObjects = new List<IObservable>(base.PropertyChanged(failureMechanism));
 
             IEnumerable<IObservable> affectedLocations = RingtoetsCommonDataSynchronizationService.ClearHydraulicBoundaryLocationOutput(
-                failureMechanism.HydraulicBoundaryLocations);
+                failureMechanism.HydraulicBoundaryLocations).ToArray();
 
             if (affectedLocations.Any())
             {
                 affectedObjects.Add(failureMechanism.HydraulicBoundaryLocations);
             }
+            affectedObjects.AddRange(affectedLocations);
             return affectedObjects;
         }
     }
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandlerTest.cs
===================================================================
diff -u -rfcd32c8e949b4581cc20adcaa7cf7639fcb69d20 -refee294afd668a5b67ffab0df11feeb46e03b147
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandlerTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandlerTest.cs)	(revision fcd32c8e949b4581cc20adcaa7cf7639fcb69d20)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandlerTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandlerTest.cs)	(revision efee294afd668a5b67ffab0df11feeb46e03b147)
@@ -140,6 +140,7 @@
             {
                 expectedAffectedObjects.Add(failureMechanism.HydraulicBoundaryLocations);
             }
+            expectedAffectedObjects.AddRange(testCase.ExpectedAffectedLocations);
             expectedAffectedObjects.Add(failureMechanism);
             CollectionAssert.AreEqual(expectedAffectedObjects, affectedObjects);
         }