Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsDataSynchronizationService.cs
===================================================================
diff -u -r78382ec129ddc7537096860680cef36f3796700d -r8b567830c978aa32ef7fbe0a16d71f637ff383e3
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsDataSynchronizationService.cs	(.../MacroStabilityInwardsDataSynchronizationService.cs)	(revision 78382ec129ddc7537096860680cef36f3796700d)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/MacroStabilityInwardsDataSynchronizationService.cs	(.../MacroStabilityInwardsDataSynchronizationService.cs)	(revision 8b567830c978aa32ef7fbe0a16d71f637ff383e3)
@@ -167,7 +167,7 @@
                                 .Cast<MacroStabilityInwardsCalculation>()
                                 .Where(pcs => ReferenceEquals(pcs.InputParameters.SurfaceLine, surfaceLine));
 
-            IList<IObservable> changedObservables = RemoveSurfaceLineDependentData(calculationScenarios).ToList();
+            List<IObservable> changedObservables = RemoveSurfaceLineDependentData(calculationScenarios).ToList();
 
             failureMechanism.SurfaceLines.Remove(surfaceLine);
             changedObservables.Add(failureMechanism.SurfaceLines);