Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs
===================================================================
diff -u -rf5ed0a2ad860787e42f81146b5b5d768d99adace -r80c86231452b9beb7e8b8eba3698ceb9c0551de3
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision f5ed0a2ad860787e42f81146b5b5d768d99adace)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision 80c86231452b9beb7e8b8eba3698ceb9c0551de3)
@@ -501,7 +501,6 @@
                 var succesfullyRemovedData = calculationGroupContext.WrappedData.Children.Remove(pipingCalculationScenarioContext.WrappedData);
                 if (succesfullyRemovedData)
                 {
-                    PipingCalculationScenarioService.RemoveCalculationScenarioFromSectionResult(pipingCalculationScenarioContext.WrappedData, pipingCalculationScenarioContext.FailureMechanism);
                     calculationGroupContext.NotifyObservers();
                 }
             }
@@ -639,8 +638,7 @@
             GeneratePipingCalculations(nodeData.WrappedData, view.SelectedSurfaceLines, nodeData.AvailableStochasticSoilModels, nodeData.FailureMechanism.GeneralInput);
 
             nodeData.NotifyObservers();
-
-            nodeData.WrappedData.AddCalculationScenariosToFailureMechanismSectionResult(nodeData.FailureMechanism);
+            // TODO still needed?
             nodeData.FailureMechanism.NotifyObservers();
         }
 
@@ -694,11 +692,6 @@
 
             parentGroupContext.WrappedData.Children.Remove(nodeData.WrappedData);
 
-            foreach (var calculation in nodeData.WrappedData.GetCalculations().Cast<PipingCalculationScenario>())
-            {
-                PipingCalculationScenarioService.RemoveCalculationScenarioFromSectionResult(calculation, nodeData.FailureMechanism);
-            }
-
             parentGroupContext.NotifyObservers();
         }