Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs
===================================================================
diff -u -r4e6c8ac0eb663ddfe4565745fb4829a8432019e2 -rc73100fd8408a2865d6fb32bd17608502686b605
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision 4e6c8ac0eb663ddfe4565745fb4829a8432019e2)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision c73100fd8408a2865d6fb32bd17608502686b605)
@@ -286,6 +286,10 @@
                           .AddSeparator()
                           .AddToggleRelevancyOfFailureMechanismItem(grassCoverErosionInwardsFailureMechanismContext, RemoveAllViewsForItem)
                           .AddSeparator()
+                          .AddValidateAllCalculationsInFailureMechanismItem(
+                                grassCoverErosionInwardsFailureMechanismContext,
+                                fm => ValidateAll(fm.WrappedData.Calculations.OfType<GrassCoverErosionInwardsCalculation>(), grassCoverErosionInwardsFailureMechanismContext.Parent),
+                                ValidateAllDataAvailableAndGetErrorMessageForCalculationsInFailureMechanism)
                           .AddPerformAllCalculationsInFailureMechanismItem(grassCoverErosionInwardsFailureMechanismContext, CalculateAll, ValidateAllDataAvailableAndGetErrorMessageForCalculationsInFailureMechanism)
                           .AddClearAllCalculationOutputInFailureMechanismItem(grassCoverErosionInwardsFailureMechanismContext.WrappedData)
                           .AddSeparator()
@@ -378,6 +382,10 @@
             builder.AddCreateCalculationGroupItem(group)
                    .AddCreateCalculationItem(context, AddCalculation)
                    .AddSeparator()
+                   .AddValidateAllCalculationsInGroupItem(
+                        context,
+                        c => ValidateAll(c.WrappedData.GetCalculations().OfType<GrassCoverErosionInwardsCalculation>(), c.AssessmentSection),
+                        ValidateAllDataAvailableAndGetErrorMessageForCalculationsInGroup)
                    .AddPerformAllCalculationsInGroupItem(group, context, CalculateAll, ValidateAllDataAvailableAndGetErrorMessageForCalculationsInGroup)
                    .AddClearAllCalculationOutputInGroupItem(group)
                    .AddSeparator();
@@ -503,7 +511,11 @@
 
             GrassCoverErosionInwardsCalculation calculation = context.WrappedData;
 
-            return builder.AddPerformCalculationItem(calculation, context, Calculate, ValidateAllDataAvailableAndGetErrorMessageForCalculation)
+            return builder.AddValidateCalculationItem(
+                            context, 
+                            c => GrassCoverErosionInwardsCalculationService.Validate(c.WrappedData, c.AssessmentSection), 
+                            ValidateAllDataAvailableAndGetErrorMessageForCalculation)
+                          .AddPerformCalculationItem(calculation, context, Calculate, ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                           .AddClearCalculationOutputItem(calculation)
                           .AddSeparator()
                           .AddRenameItem()
@@ -543,5 +555,13 @@
         }
 
         #endregion
+
+        private void ValidateAll(IEnumerable<GrassCoverErosionInwardsCalculation> grassCoverErosionInwardsCalculations, IAssessmentSection assessmentSection)
+        {
+            foreach (var calculation in grassCoverErosionInwardsCalculations)
+            {
+                GrassCoverErosionInwardsCalculationService.Validate(calculation, assessmentSection);
+            }
+        }
     }
 }
\ No newline at end of file