Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresScenariosView.cs
===================================================================
diff -u -r183d1e7ed095ea4e8024068bc4ddfcf3ac6997d3 -r74f04a12c7ff3bbba6746e2abfb7d7ee83cc29f3
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresScenariosView.cs	(.../HeightStructuresScenariosView.cs)	(revision 183d1e7ed095ea4e8024068bc4ddfcf3ac6997d3)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresScenariosView.cs	(.../HeightStructuresScenariosView.cs)	(revision 74f04a12c7ff3bbba6746e2abfb7d7ee83cc29f3)
@@ -56,7 +56,9 @@
 
             // 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())));
+                UpdateDataGridViewDataSource, cg => cg.Children.Concat<object>(cg.Children
+                                                                                 .OfType<StructuresCalculation<HeightStructuresInput>>()
+                                                                                 .Select(c => c.InputParameters)));
             calculationGroupObserver = new RecursiveObserver<CalculationGroup, ICalculationBase>(UpdateDataGridViewDataSource, c => c.Children);
         }