Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs
===================================================================
diff -u -r70469282dce77d4fc9da5a17b13679bbe579c586 -ra7c351a2f6cb6ab18a30d248a60cbf34abe47ad7
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 70469282dce77d4fc9da5a17b13679bbe579c586)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision a7c351a2f6cb6ab18a30d248a60cbf34abe47ad7)
@@ -1233,9 +1233,12 @@
 
         private static RoundedDouble GetNormativeAssessmentLevel(WaveConditionsInputContext context)
         {
-            if (context is GrassCoverErosionOutwardsWaveConditionsInputContext)
+            var grassCoverErosionOutwardsWaveConditionsInputContext = context as GrassCoverErosionOutwardsWaveConditionsInputContext;
+            if (grassCoverErosionOutwardsWaveConditionsInputContext != null)
             {
-                return context.Calculation.InputParameters.HydraulicBoundaryLocation?.DesignWaterLevelCalculation1.Output?.Result ?? RoundedDouble.NaN;
+                return grassCoverErosionOutwardsWaveConditionsInputContext.FailureMechanism.GetNormativeAssessmentLevel(
+                    grassCoverErosionOutwardsWaveConditionsInputContext.AssessmentSection,
+                    grassCoverErosionOutwardsWaveConditionsInputContext.Calculation.InputParameters.HydraulicBoundaryLocation);
             }
 
             return context.AssessmentSection.GetNormativeAssessmentLevel(context.Calculation.InputParameters.HydraulicBoundaryLocation);