Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs
===================================================================
diff -u -r4848 -r5297
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs	(.../CsvExportData.cs)	(revision 4848)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs	(.../CsvExportData.cs)	(revision 5297)
@@ -1926,22 +1926,17 @@
     [Browsable(false)]
     public string GetDesignResultFile()
     {
-        if (!string.IsNullOrEmpty(BaseFileName))
+        if (string.IsNullOrEmpty(BaseFileName) || string.IsNullOrEmpty(CalculationSubDir))
         {
-            const string surfacelineResultFileExtension = ".rsxml";
-            string fullFilename = DamProject.ProjectWorkingPath;
-            if (string.IsNullOrEmpty(CalculationSubDir))
-            {
-                throw new CsvExporterException(nameof(CalculationSubDir) + " is null or empty.");
-            }
-
-            fullFilename = Path.Combine(fullFilename, CalculationSubDir);
-            fullFilename = fullFilename + Path.DirectorySeparatorChar + BaseFileName;
-            fullFilename += surfacelineResultFileExtension;
-            return fullFilename;
+            return "";
         }
 
-        return "";
+        const string surfacelineResultFileExtension = ".rsxml";
+        string fullFilename = DamProject.ProjectWorkingPath;
+        fullFilename = Path.Combine(fullFilename, CalculationSubDir);
+        fullFilename = fullFilename + Path.DirectorySeparatorChar + BaseFileName;
+        fullFilename += surfacelineResultFileExtension;
+        return fullFilename;
     }
 
     /// <summary>
@@ -2063,8 +2058,8 @@
             case "OpenCalculationFile":
                 return (damFailureMechanismeCalculationSpecification.FailureMechanismSystemType == 
                         FailureMechanismSystemType.StabilityInside || 
-                       damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
-                       FailureMechanismSystemType.StabilityOutside);
+                        damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
+                        FailureMechanismSystemType.StabilityOutside);
             default:
                 return true;
         }