Index: DamClients/DamUI/branches/DamUI 19.3/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs
===================================================================
diff -u -r3701 -r3766
--- DamClients/DamUI/branches/DamUI 19.3/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs	(.../Location.cs)	(revision 3701)
+++ DamClients/DamUI/branches/DamUI 19.3/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs	(.../Location.cs)	(revision 3766)
@@ -1200,7 +1200,7 @@
                 {
                     foreach (var scenario in scenarios)
                     {
-                        if (scenario.RequiredSafetyFactorStabilityInnerSlope == null)
+                        if (scenario.RequiredSafetyFactorStabilityInnerSlope < 0)
                         return new[]
                         {
                             new ValidationResult(ValidationResultType.Error,