Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs
===================================================================
diff -u -r2871 -r2875
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs	(.../BackwardCompatibility.cs)	(revision 2871)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/BackwardCompatibility.cs	(.../BackwardCompatibility.cs)	(revision 2875)
@@ -19,36 +19,90 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
+using System.Globalization;
 using System.Xml;
+using Deltares.Standard.Extensions;
 
 namespace Deltares.Dam.Data.IO
 {
+    /// <summary></summary>
     public class BackwardCompatibility
     {
+        /// <summary>Updates the specified dam project data for backward compatibility.</summary>
+        /// <param name="damProjectData">The dam project data.</param>
+        /// <param name="projectFileName">Name of the project file.</param>
         public static void Update(DamProjectData damProjectData, string projectFileName)
         {
             XmlDocument xmlDocument = new XmlDocument();
             xmlDocument.Load(projectFileName);
-            XmlElement rootElement = GetElement(xmlDocument, "Locations");
 
+            XmlNodeList locationNodes = xmlDocument.GetElementsByTagName("Subject");
+            foreach (XmlNode node in locationNodes)
+            {
+                var attributeType = node.Attributes?["type"];
+                if ((attributeType != null) && (attributeType.Value == "Deltares.Dam.Data.Location"))
+                {
+                    var attributeName = node.Attributes?["Name"];
+                    var location = damProjectData.WaterBoard.Dikes[0].Locations.Find(item => item.Name.Equals(attributeName.Value));
+                    double? value;
+                    value = AttributeValueFromNode(node, "PolderLevel");
+                    UpdatePolderLevel(location, value);
+                    value = AttributeValueFromNode(node, "HeadPL2");
+                    UpdateHeadPl2(location, value);
+                    value = AttributeValueFromNode(node, "HeadPl3");
+                    UpdateHeadPl3(location, value);
+                    value = AttributeValueFromNode(node, "HeadPl4");
+                    UpdateHeadPl4(location, value);
+                }
+            }
         }
 
-        private static XmlElement GetElement(XmlNode parent, string name)
+        private static double? AttributeValueFromNode(XmlNode node, string attributeName)
         {
-            foreach (var xmlNode in parent.ChildNodes)
+            double? value = null;
+            var attribute = node.Attributes?[attributeName];
+            if ((attribute != null) && !string.IsNullOrEmpty(attribute.Value))
             {
-                XmlElement element = xmlNode as XmlElement;
-                if (element != null)
-                {
-                    if (element.Name == name)
-                    {
-                        return element;
-                    }
+                value = Double.Parse(attribute.Value, CultureInfo.InvariantCulture);
+            }
+            return value;
+        }
 
+        private static void UpdatePolderLevel(Location location, double? value)
+        {
+            if (value != null)
+            {
+                foreach (var scenario in location.Scenarios)
+                {
+                    scenario.PolderLevel = value.Value;
                 }
             }
+        }
 
-            return null;
+        private static void UpdateHeadPl2(Location location, double? value)
+        {
+            foreach (var scenario in location.Scenarios)
+            {
+                scenario.HeadPl2 = value;
+            }
         }
+
+        private static void UpdateHeadPl3(Location location, double? value)
+        {
+            foreach (var scenario in location.Scenarios)
+            {
+                scenario.HeadPl3 = value;
+            }
+        }
+
+        private static void UpdateHeadPl4(Location location, double? value)
+        {
+            foreach (var scenario in location.Scenarios)
+            {
+                scenario.HeadPl4 = value;
+            }
+        }
+
     }
 }
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/Dam/Tests/LoadCompatiblityTest.cs
===================================================================
diff -u -r2817 -r2875
--- DamClients/DamUI/trunk/src/Dam/Tests/LoadCompatiblityTest.cs	(.../LoadCompatiblityTest.cs)	(revision 2817)
+++ DamClients/DamUI/trunk/src/Dam/Tests/LoadCompatiblityTest.cs	(.../LoadCompatiblityTest.cs)	(revision 2875)
@@ -55,7 +55,7 @@
             compare = new CompareLogic();
             compare.Config.MaxDifferences = 100;
             compare.Config.CompareChildren = false;
-            compare.Config.DoublePrecision = 0.000000001;
+            compare.Config.DoublePrecision = 0.000001;
             compare.Config.MembersToIgnore = new List<string>
                                            {
                                                "SurfaceLineId",
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/VersionInfo.cs
===================================================================
diff -u -r2864 -r2875
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/VersionInfo.cs	(.../VersionInfo.cs)	(revision 2864)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/VersionInfo.cs	(.../VersionInfo.cs)	(revision 2875)
@@ -28,7 +28,12 @@
     [XmlNoKey]
     public class VersionInfo
     {
-        public const int CurrentFileVersion = 1;
+
+        /// <summary>The current file version
+        /// FileVersion 0 is for versions 18.1.3 and earlier.</summary>
+        /// FileVersion 1 is for version 19.1.1.</summary>
+        /// FileVersion 2 is for version 20.1.1. and up</summary>
+        public const int CurrentFileVersion = 2;
         /// <summary>Current File Version.</summary>
         /// <value>The file version.</value>
         ///