Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/GuiServices/DuneLocationCalculationGuiService.cs
===================================================================
diff -u -r886f53016571b5d7a65318c6e29d6da9385bbade -rbf0bb686ee2b533188f8eabdc09732e52d775888
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/GuiServices/DuneLocationCalculationGuiService.cs	(.../DuneLocationCalculationGuiService.cs)	(revision 886f53016571b5d7a65318c6e29d6da9385bbade)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/GuiServices/DuneLocationCalculationGuiService.cs	(.../DuneLocationCalculationGuiService.cs)	(revision bf0bb686ee2b533188f8eabdc09732e52d775888)
@@ -26,6 +26,7 @@
 using Core.Common.Gui.Forms.ProgressDialog;
 using log4net;
 using Ringtoets.Common.IO.HydraRing;
+using Ringtoets.Common.Service;
 using Ringtoets.DuneErosion.Data;
 using Ringtoets.DuneErosion.Service;
 using RingtoetsCommonFormsResources = Ringtoets.Common.Forms.Properties.Resources;
@@ -78,6 +79,12 @@
 
             string validationProblem = HydraulicBoundaryDatabaseHelper.ValidateFilesForCalculation(hydraulicBoundaryDatabaseFilePath,
                                                                                                    preprocessorDirectory);
+
+            if (string.IsNullOrEmpty(validationProblem))
+            {
+                TargetProbabilityCalculationServiceHelper.ValidateTargetProbability(norm, logMessage => validationProblem = logMessage);
+            }
+
             if (!string.IsNullOrEmpty(validationProblem))
             {
                 log.ErrorFormat(RingtoetsCommonFormsResources.CalculateHydraulicBoundaryLocation_Start_calculation_failed_0_,