Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -rb390c81c577202ae453281e2c1c6f983fabab240 -r029ff0ad40fcb7568d712e8be786a57a949a0b8c
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision b390c81c577202ae453281e2c1c6f983fabab240)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 029ff0ad40fcb7568d712e8be786a57a949a0b8c)
@@ -281,7 +281,10 @@
 
         private static void CalculationGroupContextOnNodeRemoved(ClosingStructuresCalculationGroupContext context, object parentNodeData)
         {
-            //Part of WTI-550
+            var parentGroupContext = (ClosingStructuresCalculationGroupContext)parentNodeData;
+
+            parentGroupContext.WrappedData.Children.Remove(context.WrappedData);
+            parentGroupContext.NotifyObservers();
         }
 
         #endregion