Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2D.cs
===================================================================
diff -u -r5210 -r5212
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2D.cs	(.../SoilProfile2D.cs)	(revision 5210)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2D.cs	(.../SoilProfile2D.cs)	(revision 5212)
@@ -199,7 +199,7 @@
     /// <param name="geometrySurface"></param>
     /// <param name="oldSurfaces"></param>
     /// <returns></returns>
-    public SoilLayer2D GetOriginalLayerFromOldSurfaces(GeometrySurface geometrySurface, IEnumerable<SoilLayer2D> oldSurfaces)
+    public static SoilLayer2D GetOriginalLayerFromOldSurfaces(GeometrySurface geometrySurface, IEnumerable<SoilLayer2D> oldSurfaces)
     {
       return GetOriginalLayerFromOldSurfaces(geometrySurface, oldSurfaces, 0.0);
     }