Index: DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/FillDamFromXmlInputTests.cs
===================================================================
diff -u -r4690 -r5090
--- DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/FillDamFromXmlInputTests.cs	(.../FillDamFromXmlInputTests.cs)	(revision 4690)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/FillDamFromXmlInputTests.cs	(.../FillDamFromXmlInputTests.cs)	(revision 5090)
@@ -22,12 +22,14 @@
 using System.Collections.Generic;
 using Deltares.DamEngine.Data.Design;
 using Deltares.DamEngine.Data.General;
+using Deltares.DamEngine.Data.Geotechnics;
 using Deltares.DamEngine.Io;
 using Deltares.DamEngine.Io.XmlInput;
 using Deltares.DamEngine.TestHelpers.Factories;
 using KellermanSoftware.CompareNetObjects;
 using NUnit.Framework;
 using Location = Deltares.DamEngine.Data.General.Location;
+using SoilProfile2D = Deltares.DamEngine.Io.XmlInput.SoilProfile2D;
 
 namespace Deltares.DamEngine.Interface.Tests;
 
@@ -140,6 +142,74 @@
         CompareDamProjectData(actualDamProjectData, expectedDamProjectData);
     }
 
+    [Test]
+    public void GivenSoilLayer2DFromXml_WhenTransferredToDamObject_ThenOuterLoopIsClosed()
+    {
+        // Setup
+        var inputSoilProfile2D = new SoilProfile2D
+        {
+            Layers2D = new SoilProfile2DLayer2D[1]
+        };
+        inputSoilProfile2D.Layers2D[0] = new SoilProfile2DLayer2D
+        {
+            Surface = new SoilProfile2DLayer2DSurface
+            {
+                OuterLoop = new SoilProfile2DLayer2DSurfaceOuterPoint[4]
+            }
+        };
+        inputSoilProfile2D.Layers2D[0].Surface.OuterLoop[0] = new SoilProfile2DLayer2DSurfaceOuterPoint
+        {
+            X = 0,
+            Z = 0
+        };
+        inputSoilProfile2D.Layers2D[0].Surface.OuterLoop[1] = new SoilProfile2DLayer2DSurfaceOuterPoint
+        {
+            X = 10,
+            Z = 0
+        };
+        inputSoilProfile2D.Layers2D[0].Surface.OuterLoop[2] = new SoilProfile2DLayer2DSurfaceOuterPoint
+        {
+            X = 10,
+            Z = -5
+        };
+        inputSoilProfile2D.Layers2D[0].Surface.OuterLoop[3] = new SoilProfile2DLayer2DSurfaceOuterPoint
+        {
+            X = 0,
+            Z = -5
+        };                                               
+       
+        // Call
+        var soilProfile2D = new Data.Geotechnics.SoilProfile2D();
+        FillDamFromXmlInput.AddLayers2D(inputSoilProfile2D, soilProfile2D,  new SoilList());
+        
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(soilProfile2D.Geometry.Surfaces, Has.Count.EqualTo(1));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList, Has.Count.EqualTo(4));
+            
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[0].HeadPoint.X, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[0].HeadPoint.Z, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[0].EndPoint.X, Is.EqualTo(10));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[0].EndPoint.Z, Is.EqualTo(0));
+            
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[1].HeadPoint.X, Is.EqualTo(10));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[1].HeadPoint.Z, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[1].EndPoint.X, Is.EqualTo(10));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[1].EndPoint.Z, Is.EqualTo(-5));
+            
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[2].HeadPoint.X, Is.EqualTo(10));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[2].HeadPoint.Z, Is.EqualTo(-5));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[2].EndPoint.X, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[2].EndPoint.Z, Is.EqualTo(-5));
+            
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[3].HeadPoint.X, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[3].HeadPoint.Z, Is.EqualTo(-5));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[3].EndPoint.X, Is.EqualTo(0));
+            Assert.That(soilProfile2D.Geometry.Surfaces[0].OuterLoop.CurveList[3].EndPoint.Z, Is.EqualTo(0));
+        });
+    }
+
     private void CompareDamProjectData(DamProjectData actual, DamProjectData expected)
     {
         Assert.That(DamProjectCalculationSpecification.SelectedAnalysisType, Is.EqualTo(FactoryForDamProjectData.ExpectedAnalysisType));
Index: DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs
===================================================================
diff -u -r5013 -r5090
--- DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 5013)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 5090)
@@ -831,7 +831,7 @@
         }
     }
 
-    private static void AddLayers2D(Io.XmlInput.SoilProfile2D inputSoilProfile2D, SoilProfile2D soilProfile2D, SoilList soils)
+    internal static void AddLayers2D(Io.XmlInput.SoilProfile2D inputSoilProfile2D, SoilProfile2D soilProfile2D, SoilList soils)
     {
         if (inputSoilProfile2D != null)
         {
Index: DamEngine/trunk/src/Deltares.DamEngine.Interface/Deltares.DamEngine.Interface.csproj
===================================================================
diff -u -r4796 -r5090
--- DamEngine/trunk/src/Deltares.DamEngine.Interface/Deltares.DamEngine.Interface.csproj	(.../Deltares.DamEngine.Interface.csproj)	(revision 4796)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface/Deltares.DamEngine.Interface.csproj	(.../Deltares.DamEngine.Interface.csproj)	(revision 5090)
@@ -4,6 +4,11 @@
         <Folder Include="Properties"/>
     </ItemGroup>
     <ItemGroup>
+        <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+            <_Parameter1>Deltares.DamEngine.Interface.Tests</_Parameter1>
+        </AssemblyAttribute>
+    </ItemGroup>
+    <ItemGroup>
         <ProjectReference Include="..\Deltares.DamEngine.Calculators\Deltares.DamEngine.Calculators.csproj"/>
         <ProjectReference Include="..\Deltares.DamEngine.Data\Deltares.DamEngine.Data.csproj"/>
         <ProjectReference Include="..\Deltares.DamEngine.Io\Deltares.DamEngine.Io.csproj"/>