Index: src/Deltares.DSoilModel.Data/DSoilModelIO.cs
===================================================================
diff -u -r66 -r280
--- src/Deltares.DSoilModel.Data/DSoilModelIO.cs	(.../DSoilModelIO.cs)	(revision 66)
+++ src/Deltares.DSoilModel.Data/DSoilModelIO.cs	(.../DSoilModelIO.cs)	(revision 280)
@@ -508,19 +508,26 @@
         private static void ReadSoilsFromOldDataBaseAndAddToProject(ref DSoilModelProject project, GeoDatabase geoDatabase)
         {
             SoilList newSoils = geoDatabase.ReadSoils(new List<Soil>());
-            project.AddSoilDataToProject(newSoils);
+            project.AddSoilDataToProject(newSoils, true);
 
             // backward compatibility, isAquifer dictionary
             foreach (var newSoil in newSoils.Soils)
             {
                 // Set Aquifer dictionary too
                 if (newSoils.AquiferDictionary.ContainsKey(newSoil))
                 {
-                    if (project.Soils.AquiferDictionary.ContainsKey(newSoil))
+                    bool found = false;
+                    foreach (var key in project.Soils.AquiferDictionary)
                     {
-                        project.Soils.AquiferDictionary[newSoil] = newSoils.AquiferDictionary[newSoil];
+                        if (String.Compare(key.Key.Name, newSoil.Name, true) == 0)
+                        {
+                            newSoil.Name = key.Key.Name;
+                            project.Soils.AquiferDictionary[newSoil] = newSoils.AquiferDictionary[newSoil];
+                            found = true;
+                            break;
+                        }
                     }
-                    else
+                    if (!found)
                     {
                         project.Soils.AquiferDictionary.Add(newSoil, newSoils.AquiferDictionary[newSoil]);
                     }