Index: Ringtoets/Integration/src/Ringtoets.Integration.Service/DesignWaterLevelCalculationActivity.cs
===================================================================
diff -u -r883060cccacd8501ff89325a242fc352c54e8a53 -rc45538da49b7940b722e1f12b95d16beb4ee8206
--- Ringtoets/Integration/src/Ringtoets.Integration.Service/DesignWaterLevelCalculationActivity.cs	(.../DesignWaterLevelCalculationActivity.cs)	(revision 883060cccacd8501ff89325a242fc352c54e8a53)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Service/DesignWaterLevelCalculationActivity.cs	(.../DesignWaterLevelCalculationActivity.cs)	(revision c45538da49b7940b722e1f12b95d16beb4ee8206)
@@ -57,23 +57,24 @@
 
         protected override void OnRun()
         {
-            if (double.IsNaN(hydraulicBoundaryLocation.DesignWaterLevel))
+            if (!double.IsNaN(hydraulicBoundaryLocation.DesignWaterLevel))
             {
-                PerformRun(() => DesignWaterLevelCalculationService.Validate(assessmentSection.HydraulicBoundaryDatabase, hydraulicBoundaryLocation),
+                State = ActivityState.Skipped;
+                return;
+            }
+
+            PerformRun(() => DesignWaterLevelCalculationService.Validate(assessmentSection.HydraulicBoundaryDatabase, hydraulicBoundaryLocation),
                            () => hydraulicBoundaryLocation.DesignWaterLevel = double.NaN,
                            () => DesignWaterLevelCalculationService.Calculate(assessmentSection,
                                                                               assessmentSection.HydraulicBoundaryDatabase,
                                                                               hydraulicBoundaryLocation,
                                                                               assessmentSection.Name)); // TODO: Provide name of reference line instead
-            }
+            
         }
 
         protected override void OnFinish()
         {
-            if (double.IsNaN(hydraulicBoundaryLocation.DesignWaterLevel))
-            {
-                PerformFinish(() => hydraulicBoundaryLocation.DesignWaterLevel = Output.Result, hydraulicBoundaryLocation);
-            }
+            PerformFinish(() => hydraulicBoundaryLocation.DesignWaterLevel = Output.Result, hydraulicBoundaryLocation);
         }
     }
 }