Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs
===================================================================
diff -u -r4764 -r4768
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4764)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4768)
@@ -44,13 +44,13 @@
         }
 
         if (Math.Round(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelOutside).X, precisionDecimals) <
-            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points.First().X, precisionDecimals))
+            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points[0].X, precisionDecimals))
         {
             return false;
         }
 
         if (Math.Round(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).X, precisionDecimals) >
-            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points.Last().X, precisionDecimals))
+            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points[soilProfile2D.Geometry.SurfaceLine.Points.Count - 1].X, precisionDecimals))
         {
             return false;
         }