Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsFailureMechanismResultView.cs
===================================================================
diff -u -r83003ce3a26b35511212cc95936e8574bea66516 -r5758dcbd3c038700c314cb3a9921659f88f32f74
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsFailureMechanismResultView.cs	(.../GrassCoverErosionInwardsFailureMechanismResultView.cs)	(revision 83003ce3a26b35511212cc95936e8574bea66516)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsFailureMechanismResultView.cs	(.../GrassCoverErosionInwardsFailureMechanismResultView.cs)	(revision 5758dcbd3c038700c314cb3a9921659f88f32f74)
@@ -54,24 +54,17 @@
             // The concat is needed to observe the input of calculations in child groups.
             calculationInputObserver = new RecursiveObserver<CalculationGroup, ICalculationInput>(
                 UpdateDataGridViewDataSource,
-                cg => cg.Children.Concat<object>(
-                    cg.Children
-                      .OfType<ICalculation>()
-                      .Select(c => c.GetObservableInput())
-                          )
-                );
+                cg => cg.Children.Concat<object>(cg.Children
+                                                   .OfType<GrassCoverErosionInwardsCalculation>()
+                                                   .Select(c => c.GetObservableInput())));
             calculationOutputObserver = new RecursiveObserver<CalculationGroup, ICalculationOutput>(
                 UpdateDataGridViewDataSource,
-                cg => cg.Children.Concat<object>(
-                    cg.Children
-                      .OfType<ICalculation>()
-                      .Select(c => c.GetObservableOutput())
-                          )
-                );
+                cg => cg.Children.Concat<object>(cg.Children
+                                                   .OfType<GrassCoverErosionInwardsCalculation>()
+                                                   .Select(c => c.GetObservableOutput())));
             calculationGroupObserver = new RecursiveObserver<CalculationGroup, ICalculationBase>(
                 UpdateDataGridViewDataSource,
-                c => c.Children
-                );
+                c => c.Children);
 
             AddDataGridColumns();
         }