Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorShoulderPerPoint.cs
===================================================================
diff -u -r1368 -r1376
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorShoulderPerPoint.cs	(.../DesignCalculatorShoulderPerPoint.cs)	(revision 1368)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorShoulderPerPoint.cs	(.../DesignCalculatorShoulderPerPoint.cs)	(revision 1376)
@@ -63,8 +63,8 @@
         {
             var designResults = new List<DesignResult>();
             var location = damKernelInput.Location;
-            var surfaceLine = location.SurfaceLine;
-            var orgSurfaceLine = surfaceLine;
+            var subSoilScenario = damKernelInput.SubSoilScenario;
+            var surfaceLine = designScenario.GetMostRecentSurfaceLine(subSoilScenario.SoilProfile1D, subSoilScenario.StiFileName);
             try
             {
                 List<LogMessage> locationCalculationMessages;
@@ -153,7 +153,6 @@
             }
             finally
             {
-                damKernelInput.Location.SurfaceLine = orgSurfaceLine;
                 foreach (var designResult in designResults)
                 {
                     designCalculations.Add(designResult);
Index: DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingSellmeijer4ForcesTests.cs
===================================================================
diff -u -r1367 -r1376
--- DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingSellmeijer4ForcesTests.cs	(.../PipingSellmeijer4ForcesTests.cs)	(revision 1367)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingSellmeijer4ForcesTests.cs	(.../PipingSellmeijer4ForcesTests.cs)	(revision 1376)
@@ -153,7 +153,7 @@
             Assert.AreEqual(4.5, redesignedSurfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).Z, tolerance);
             // ShoulderWidth = X_Kruin binnenberm - X_Insteek binnenberm = 65.01 - 32.01 = 33.0
             // Read from PipingSellmeijer4Forces_Piping_CharacteristicPoints.csv by export surfacelines in Release
-            Assert.AreEqual(33.0, redesignedSurfaceLine.DetermineShoulderLength(), tolerance);
+            Assert.AreEqual(36.0, redesignedSurfaceLine.DetermineShoulderLength(), tolerance);
 
             // The following test are the same as for CanPerformSellmeijer4ForcesDesignWithAdaptionPipingVoorbeeld1()
             Assert.AreEqual(true, output.Results.CalculationResults.DesignResults[0].PipingDesignResults.UpliftSituation.IsUplift);
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs
===================================================================
diff -u -r1371 -r1376
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1371)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1376)
@@ -201,7 +201,7 @@
             finally
             {
                 // Restore the original surfaceline
-                location.SurfaceLine = orgLocationSurfaceLine.FullDeepClone();
+                location.SurfaceLine = orgLocationSurfaceLine;
 
             }