Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Validator.cs
===================================================================
diff -u -r5444 -r5449
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Validator.cs	(.../SurfaceLine2Validator.cs)	(revision 5444)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Validator.cs	(.../SurfaceLine2Validator.cs)	(revision 5449)
@@ -94,10 +94,29 @@
     /// <returns></returns>
     public static bool AreAllPointsXCoordinatesAscending(SurfaceLine2 line)
     {
-        line.Geometry.SyncPoints();
-        return AreGeometryPointsXCoordinatesAscending(line.Geometry.Points);
+        if (line.Geometry.Points.Count == line.Geometry.CalcPoints.Count)
+        {
+            if (ArePointsAndCalcPointEqual(line))
+            {
+                return AreGeometryPointsXCoordinatesAscending(line.Geometry.Points);
+            }
+        }
+        return false;
     }
     
+    private static bool ArePointsAndCalcPointEqual(SurfaceLine2 line)
+    {
+        for (int i = 0; i < line.Geometry.Points.Count; i++)
+        {
+            var geometryPoint = new GeometryPoint(line.Geometry.CalcPoints[i].X, line.Geometry.CalcPoints[i].Z);
+            if (!line.Geometry.Points[i].LocationEquals(geometryPoint))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    
     /// <summary>
     /// Determines whether all characteristic points are in correct shape.
     /// </summary>