Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs
===================================================================
diff -u -r16cb360eae0014270ebb6700054afdbbd565ae65 -r2ebc37cd8cfea18e73b2db4975be5a48272ba9ba
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivity.cs)	(revision 16cb360eae0014270ebb6700054afdbbd565ae65)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivity.cs)	(revision 2ebc37cd8cfea18e73b2db4975be5a48272ba9ba)
@@ -86,6 +86,8 @@
         protected override void PerformCalculation()
         {
             calculationService.OnProgress = UpdateProgressText;
+
+            StabilityStoneCoverDataSynchronizationService.ClearWaveConditionsCalculationOutput(calculation);
             calculationService.Calculate(
                 calculation, assessmentSection, failureMechanism.GeneralInput, hlcdFilePath);
         }