Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -r3c283d1bc64a0dcc92291152963be2a9e6b8108f -r277048d204ab4cfad4aa5de4d57ef38b56642c25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 3c283d1bc64a0dcc92291152963be2a9e6b8108f)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 277048d204ab4cfad4aa5de4d57ef38b56642c25)
@@ -87,7 +87,7 @@
 
             yield return new PropertyInfo<GrassCoverErosionOutwardsWaveConditionsInputContext, GrassCoverErosionOutwardsWaveConditionsInputContextProperties>
             {
-                CreateInstance = context => new GrassCoverErosionOutwardsWaveConditionsInputContextProperties(context, new CalculationInputPropertyChangeHandler())
+                CreateInstance = context => new GrassCoverErosionOutwardsWaveConditionsInputContextProperties(context, new ObservablePropertyChangeHandler(context.Calculation))
             };
 
             yield return new PropertyInfo<GrassCoverErosionOutwardsDesignWaterLevelLocationContext, GrassCoverErosionOutwardsDesignWaterLevelLocationContextProperties>();