Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -r16cb360eae0014270ebb6700054afdbbd565ae65 -r78d81c5277da2f3f016dcde8ef1de0cb39fd4248
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 16cb360eae0014270ebb6700054afdbbd565ae65)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 78d81c5277da2f3f016dcde8ef1de0cb39fd4248)
@@ -624,9 +624,7 @@
 
             builder.AddSeparator()
                    .AddValidateAllCalculationsInGroupItem(nodeData,
-                                                          cg => ValidateAll(
-                                                              cg.WrappedData.GetCalculations().OfType<GrassCoverErosionOutwardsWaveConditionsCalculation>(),
-                                                              cg.AssessmentSection.HydraulicBoundaryDatabase),
+                                                          ValidateAll,
                                                           ValidateAllDataAvailableAndGetErrorMessageForCalculationGroup)
                    .AddPerformAllCalculationsInGroupItem(group, nodeData, CalculateAll, ValidateAllDataAvailableAndGetErrorMessageForCalculationGroup)
                    .AddClearAllCalculationOutputInGroupItem(group)
@@ -706,6 +704,12 @@
             }
         }
 
+        private static void ValidateAll(GrassCoverErosionOutwardsWaveConditionsCalculationGroupContext context)
+        {
+            ValidateAll(context.WrappedData.GetCalculations().OfType<GrassCoverErosionOutwardsWaveConditionsCalculation>(),
+                        context.AssessmentSection.HydraulicBoundaryDatabase);
+        }
+
         private static string ValidateAllDataAvailableAndGetErrorMessageForCalculationGroup(GrassCoverErosionOutwardsWaveConditionsCalculationGroupContext context)
         {
             return ValidateAllDataAvailableAndGetErrorMessage(context.AssessmentSection);
@@ -801,12 +805,7 @@
                 .AddExportItem()
                 .AddSeparator()
                 .AddValidateCalculationItem(nodeData,
-                                            c => ValidateAll(
-                                                new[]
-                                                {
-                                                    c.WrappedData
-                                                },
-                                                c.AssessmentSection.HydraulicBoundaryDatabase),
+                                            ValidateAll,
                                             ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                 .AddPerformCalculationItem(calculation, nodeData, PerformCalculation, ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                 .AddClearCalculationOutputItem(calculation)
@@ -826,6 +825,16 @@
             return ValidateAllDataAvailableAndGetErrorMessage(context.AssessmentSection);
         }
 
+        private static void ValidateAll(GrassCoverErosionOutwardsWaveConditionsCalculationContext context)
+        {
+            ValidateAll(
+                new[]
+                {
+                    context.WrappedData
+                },
+                context.AssessmentSection.HydraulicBoundaryDatabase);
+        }
+
         private void PerformCalculation(GrassCoverErosionOutwardsWaveConditionsCalculation calculation,
                                         GrassCoverErosionOutwardsWaveConditionsCalculationContext context)
         {