Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs
===================================================================
diff -u -refee294afd668a5b67ffab0df11feeb46e03b147 -r8bb6e849266ec28412ebfe23beccd7235c4db9bf
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs)	(revision efee294afd668a5b67ffab0df11feeb46e03b147)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs	(.../GrassCoverErosionOutwardsFailureMechanismPropertyChangeHandler.cs)	(revision 8bb6e849266ec28412ebfe23beccd7235c4db9bf)
@@ -46,7 +46,7 @@
         protected override bool RequiresConfirmation(GrassCoverErosionOutwardsFailureMechanism failureMechanism)
         {
             return base.RequiresConfirmation(failureMechanism) ||
-                   failureMechanism.HydraulicBoundaryLocations.Any(c => c.WaveHeightOutput != null || c.DesignWaterLevelOutput != null);
+                   failureMechanism.HydraulicBoundaryLocations.Any(c => c.WaveHeightCalculation.HasOutput || c.DesignWaterLevelCalculation.HasOutput);
         }
 
         protected override IEnumerable<IObservable> PropertyChanged(GrassCoverErosionOutwardsFailureMechanism failureMechanism)