Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresDataSynchronizationService.cs
===================================================================
diff -u -rce9e1d476f00cfb42ce2a8ab6c762baf5abfd97b -r2a0fbe6ec22928831305671ecd4f41030b827250
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresDataSynchronizationService.cs	(.../ClosingStructuresDataSynchronizationService.cs)	(revision ce9e1d476f00cfb42ce2a8ab6c762baf5abfd97b)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresDataSynchronizationService.cs	(.../ClosingStructuresDataSynchronizationService.cs)	(revision 2a0fbe6ec22928831305671ecd4f41030b827250)
@@ -142,16 +142,17 @@
             foreach (StructuresCalculation<ClosingStructuresInput> calculation in calculationWithRemovedClosingStructure)
             {
                 calculation.InputParameters.Structure = null;
-
-                IEnumerable<StructuresFailureMechanismSectionResult<ClosingStructuresInput>> affectedSectionResults =
-                    StructuresHelper.Delete(failureMechanism.SectionResults, calculation, closingStructureCalculations);
-                foreach (StructuresFailureMechanismSectionResult<ClosingStructuresInput> result in affectedSectionResults)
-                {
-                    changedObservables.Add(result);
-                }
                 changedObservables.Add(calculation.InputParameters);
             }
 
+            IEnumerable<StructuresFailureMechanismSectionResult<ClosingStructuresInput>> affectedSectionResults =
+                StructuresHelper.UpdateCalculationToSectionResultAssignments(failureMechanism.SectionResults, closingStructureCalculations);
+
+            foreach (StructuresFailureMechanismSectionResult<ClosingStructuresInput> result in affectedSectionResults)
+            {
+                changedObservables.Add(result);
+            }
+
             failureMechanism.ClosingStructures.Remove(structure);
             changedObservables.Add(failureMechanism.ClosingStructures);