Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs
===================================================================
diff -u -r670 -r672
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 670)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 672)
@@ -28,7 +28,7 @@
         /// </summary>
         /// <param name="damKernelInput">The dam kernel input.</param>
         /// <returns></returns>
-        public IKernelDataInput Prepare(DamKernelInput damKernelInput)
+        public PrepareResult Prepare(DamKernelInput damKernelInput, out IKernelDataInput kernelDataInput)
         {
             if (damKernelInput.SubSoilScenario.SegmentFailureMechanismType == FailureMechanismSystemType.Piping)
             {
@@ -71,7 +71,7 @@
                 // rekening houdend met zeespiegelrijzing etc.(zie paragraaf 3.7.2). In dien ter plaatse van het uittreepunt of de opbarstlocatie 
                 // geen vrije waterstand heerst kan gerekend worden met het maaiveldniveau, rekening houdend met eventuele maaiveld daling (zie paragraaf 3.7.2)."
                 var referenceLevel = Math.Max(location.PolderLevel, surfaceLevel);
-                return new DamPipingBlighInput()
+                kernelDataInput = new DamPipingBlighInput()
                 {
                     HRiver = riverLevel,
                     HExit = referenceLevel,
@@ -82,7 +82,8 @@
                     IsUplift = isUplift
                 };
             }
-            return null;
+            kernelDataInput = null;
+            return PrepareResult.NotRelevant;
         }
 
         /// <summary>
@@ -172,7 +173,7 @@
         }
 
         /// <summary>
-        /// Fills the design results with the kernel output.
+        /// Fills the design results from the kernel output.
         /// </summary>
         /// <param name="damKernelInput">The dam kernel input.</param>
         /// <param name="kernelDataOutput">The kernel data output.</param>