Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -r4791bede4dd0cef468ade017c236dc1efc64b163 -r151cae0869d7173dd61dfb4d85f6f2b545222e1f
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 4791bede4dd0cef468ade017c236dc1efc64b163)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 151cae0869d7173dd61dfb4d85f6f2b545222e1f)
@@ -398,8 +398,14 @@
             return ValidateAllDataAvailableAndGetErrorMessage(context.AssessmentSection, context.FailureMechanism);
         }
 
-        private static void CalculationContextOnNodeRemoved(ClosingStructuresCalculationContext arg1, object arg2)
+        private static void CalculationContextOnNodeRemoved(ClosingStructuresCalculationContext context, object parentData)
         {
+            var calculationGroupContext = parentData as ClosingStructuresCalculationGroupContext;
+            if (calculationGroupContext != null)
+            {
+                calculationGroupContext.WrappedData.Children.Remove(context.WrappedData);
+                calculationGroupContext.NotifyObservers();
+            }
         }
 
         #endregion