Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs
===================================================================
diff -u -r2903 -r2909
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs	(.../BackwardCompatibility.cs)	(revision 2903)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs	(.../BackwardCompatibility.cs)	(revision 2909)
@@ -27,7 +27,7 @@
 namespace Deltares.Dam.Data.IO
 {
     /// <summary></summary>
-    public class BackwardCompatibility
+    public static class BackwardCompatibility
     {
         /// <summary>Updates the specified dam project data for backward compatibility.</summary>
         /// <param name="damProjectData">The dam project data.</param>
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProject.cs
===================================================================
diff -u -r2903 -r2909
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProject.cs	(.../DamProject.cs)	(revision 2903)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProject.cs	(.../DamProject.cs)	(revision 2909)
@@ -331,7 +331,7 @@
                 if (this.GetMainVersion(fileVersion) == "19.1")
                 {
                     this.DamProjectData.VersionInfo.FileVersionAsRead = 1;
-                };
+                }
             }
         }
 
@@ -428,7 +428,7 @@
                         soil.Assign(newSoil);
                     }
                     // update aquifer dictionary too
-                    if (soilList.AquiferDictionary.ContainsKey(newSoil))
+                    if (newSoil != null && soilList.AquiferDictionary.ContainsKey(newSoil))
                     {
                         if (dike.SoilList.AquiferDictionary.ContainsKey(soil))
                         {
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProjectData.cs
===================================================================
diff -u -r2864 -r2909
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProjectData.cs	(.../DamProjectData.cs)	(revision 2864)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamProjectData.cs	(.../DamProjectData.cs)	(revision 2909)
@@ -41,7 +41,6 @@
     public class DamProjectData : Project, IDomain, IDisposable
     {
         public readonly double MissValStabilitySafetyFactor = -1.0;
-        private VersionInfo versionInfo;
         private WaterBoard waterBoard;
         private DamProjectCalculationSpecification damProjectCalculationSpecification;
         private WaterBoardJob waterBoardJob = null;
@@ -61,19 +60,15 @@
         /// </summary>
         public DamProjectData()
         {
-            this.versionInfo = new VersionInfo();
+            this.VersionInfo = new VersionInfo();
             this.waterBoard = new WaterBoard();
             this.waterBoardJob = null;
             this.damProjectCalculationSpecification = new DamProjectCalculationSpecification();            
         }
 
         /// <summary>Gets the version information.</summary>
         /// <value>The version information.</value>
-        public VersionInfo VersionInfo
-        {
-            get { return versionInfo; }
-            set { versionInfo = value; }
-        }
+        public VersionInfo VersionInfo { get; set; }
 
         /// <summary>
         /// Gets or sets the project working path.