Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -r5f489223b4d730eec42acd55533dd012d10dd1ca -rc82e195aaa6fea71270f7d98520ff314f3432d0e
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 5f489223b4d730eec42acd55533dd012d10dd1ca)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision c82e195aaa6fea71270f7d98520ff314f3432d0e)
@@ -544,15 +544,15 @@
                 if (dialog.SelectedItems.Any())
                 {
                     GenerateClosingStructuresCalculations(
-                        nodeData.FailureMechanism.SectionResults,
+                        nodeData.FailureMechanism,
                         dialog.SelectedItems.Cast<ClosingStructure>(),
                         nodeData.WrappedData.Children);
                     nodeData.NotifyObservers();
                 }
             }
         }
 
-        private static void GenerateClosingStructuresCalculations(IEnumerable<ClosingStructuresFailureMechanismSectionResult> sectionResults, IEnumerable<ClosingStructure> structures, IList<ICalculationBase> calculations)
+        private static void GenerateClosingStructuresCalculations(ClosingStructuresFailureMechanism failureMechanism, IEnumerable<ClosingStructure> structures, IList<ICalculationBase> calculations)
         {
             foreach (var structure in structures)
             {
@@ -566,7 +566,9 @@
                 };
                 calculations.Add(calculation);
             }
-            StructuresHelper.UpdateCalculationToSectionResultAssignments(sectionResults, calculations.Cast<StructuresCalculation<ClosingStructuresInput>>());
+            StructuresHelper.UpdateCalculationToSectionResultAssignments(
+                failureMechanism.SectionResults,
+                failureMechanism.Calculations.Cast<StructuresCalculation<ClosingStructuresInput>>());
         }
 
         private static void ValidateAll(ClosingStructuresCalculationGroupContext context)