Index: src/Deltares.DSoilModel.Data/DSoilModelProject.cs
===================================================================
diff -u -r403 -r435
--- src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 403)
+++ src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 435)
@@ -727,6 +727,8 @@
                         // Is a different soil with different properties that should be added under a new name
                         UniqueNameProvider.ProvideUniqueName(soils.Soils, newSoil);
 
+                        CheckValiditySoil(newSoil);
+
                         soils.Add(newSoil);
                         if (newSoilData.AquiferDictionary != null && newSoilData.AquiferDictionary.ContainsKey(newSoil))
                         {
@@ -1307,5 +1309,21 @@
             var dy = point2.Y - point1.Y;
             return Math.Sqrt(dx * dx + dy * dy);
         }
+    
+        // Check the stress model for the given - set to None if not C-Phi or Su berekend
+        private void CheckValiditySoil(Soil soil)
+        {
+            if (soil.ShearStrengthModel != ShearStrengthModel.CPhi && soil.ShearStrengthModel != ShearStrengthModel.CuCalculated && soil.ShearStrengthModel != ShearStrengthModel.CuCalculatedYield)
+            {
+                soil.ShearStrengthModel = ShearStrengthModel.None;
+                LogManager.Add(new LogMessage(LogMessageType.Warning, this, string.Format(LocalizationManager.GetTranslatedText(this, "UnknownStrengthModel"), soil.Name)));
+            }
+            if (soil.ShearStrengthModel == ShearStrengthModel.CuCalculatedYield)
+            {
+                soil.ShearStrengthModel = ShearStrengthModel.CuCalculated;
+                soil.UsePop = false;
+
+            }
+        }          
     }
 }
\ No newline at end of file