Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/PipingCalculationsView.cs
===================================================================
diff -u -r26fde08dff31104fdc204b8fab78a61adaa214d6 -r0bd99fbcdd44bb84757a0270af6f5085dbd76648
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/PipingCalculationsView.cs	(.../PipingCalculationsView.cs)	(revision 26fde08dff31104fdc204b8fab78a61adaa214d6)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/PipingCalculationsView.cs	(.../PipingCalculationsView.cs)	(revision 0bd99fbcdd44bb84757a0270af6f5085dbd76648)
@@ -52,7 +52,7 @@
         private const int selectableHydraulicBoundaryLocationColumnIndex = 4;
 
         private readonly Observer assessmentSectionObserver;
-        private readonly RecursiveObserver<CalculationGroup, PipingInput> pipingInputObserver;
+        private readonly RecursiveObserver<CalculationGroup, MacroStabilityInwardsInput> pipingInputObserver;
         private readonly RecursiveObserver<CalculationGroup, CalculationGroup> pipingCalculationGroupObserver;
         private readonly RecursiveObserver<CalculationGroup, PipingCalculationScenario> pipingCalculationObserver;
         private readonly Observer failureMechanismObserver;
@@ -79,7 +79,7 @@
             failureMechanismObserver = new Observer(OnFailureMechanismUpdate);
             assessmentSectionObserver = new Observer(UpdateSelectableHydraulicBoundaryLocationsColumn);
             // The concat is needed to observe the input of calculations in child groups.
-            pipingInputObserver = new RecursiveObserver<CalculationGroup, PipingInput>(UpdateDataGridViewDataSource, pcg => pcg.Children.Concat<object>(pcg.Children.OfType<PipingCalculationScenario>().Select(pc => pc.InputParameters)));
+            pipingInputObserver = new RecursiveObserver<CalculationGroup, MacroStabilityInwardsInput>(UpdateDataGridViewDataSource, pcg => pcg.Children.Concat<object>(pcg.Children.OfType<PipingCalculationScenario>().Select(pc => pc.InputParameters)));
             pipingCalculationGroupObserver = new RecursiveObserver<CalculationGroup, CalculationGroup>(UpdateDataGridViewDataSource, pcg => pcg.Children);
             pipingCalculationObserver = new RecursiveObserver<CalculationGroup, PipingCalculationScenario>(dataGridViewControl.RefreshDataGridView, pcg => pcg.Children);