Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs
===================================================================
diff -u -r673e35de0df920529e5dda63ea8b4dfb08ed65a8 -r5758dcbd3c038700c314cb3a9921659f88f32f74
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision 673e35de0df920529e5dda63ea8b4dfb08ed65a8)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision 5758dcbd3c038700c314cb3a9921659f88f32f74)
@@ -54,9 +54,19 @@
             DataGridViewControl.AddCellFormattingHandler(DisableIrrelevantFieldsFormatting);
 
             // 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<ICalculationScenario>().Select(c => c.GetObservableInput())));
-            calculationOutputObserver = new RecursiveObserver<CalculationGroup, ICalculationOutput>(UpdateDataGridViewDataSource, cg => cg.Children.Concat<object>(cg.Children.OfType<ICalculationScenario>().Select(c => c.GetObservableOutput())));
-            calculationGroupObserver = new RecursiveObserver<CalculationGroup, ICalculationBase>(UpdateDataGridViewDataSource, c => c.Children);
+            calculationInputObserver = new RecursiveObserver<CalculationGroup, ICalculationInput>(
+                UpdateDataGridViewDataSource,
+                cg => cg.Children.Concat<object>(cg.Children
+                                                   .OfType<PipingCalculationScenario>()
+                                                   .Select(c => c.GetObservableInput())));
+            calculationOutputObserver = new RecursiveObserver<CalculationGroup, ICalculationOutput>(
+                UpdateDataGridViewDataSource,
+                cg => cg.Children.Concat<object>(cg.Children
+                                                   .OfType<PipingCalculationScenario>()
+                                                   .Select(c => c.GetObservableOutput())));
+            calculationGroupObserver = new RecursiveObserver<CalculationGroup, ICalculationBase>(
+                UpdateDataGridViewDataSource,
+                c => c.Children);
 
             AddDataGridColumns();
         }