Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -rc51ba92268d9a8272778e758fd0f9a71a0d61849 -r948bc61d0095021cfad938557c5b98f00a150044
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision c51ba92268d9a8272778e758fd0f9a71a0d61849)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 948bc61d0095021cfad938557c5b98f00a150044)
@@ -549,8 +549,7 @@
                     hydraulicBoundaryLocationCalculationGuiService.CalculateDesignWaterLevels(
                         assessmentSection.HydraulicBoundaryDatabase.FilePath,
                         assessmentSection.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory(),
-                        nodeData.WrappedData,
-                        hbl => hbl.DesignWaterLevelCalculation1,
+                        nodeData.WrappedData.Select(l => l.DesignWaterLevelCalculation1),
                         mechanismSpecificNorm,
                         new GrassCoverErosionOutwardsDesignWaterLevelCalculationMessageProvider());
                 });
@@ -600,8 +599,7 @@
                     hydraulicBoundaryLocationCalculationGuiService.CalculateWaveHeights(
                         assessmentSection.HydraulicBoundaryDatabase.FilePath,
                         assessmentSection.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory(),
-                        nodeData.WrappedData,
-                        hbl => hbl.WaveHeightCalculation1,
+                        nodeData.WrappedData.Select(l => l.WaveHeightCalculation1),
                         mechanismSpecificNorm,
                         new GrassCoverErosionOutwardsWaveHeightCalculationMessageProvider());
                 });