Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesInput.cs
===================================================================
diff -u -r624 -r687
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesInput.cs	(.../DamPipingSellmeijer4ForcesInput.cs)	(revision 624)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesInput.cs	(.../DamPipingSellmeijer4ForcesInput.cs)	(revision 687)
@@ -92,12 +92,5 @@
         /// </value>
         public double WaterViscosity { get; set; }
         
-        /// <summary>
-        /// Gets or sets a value indicating whether uplift occurs.
-        /// </summary>
-        /// <value>
-        ///   <c>true</c> if this instance is uplift; otherwise, <c>false</c>.
-        /// </value>
-        public bool IsUplift { get; set; }
     }
 }
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs
===================================================================
diff -u -r686 -r687
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs	(.../DamPipingSellmeijer4ForcesKernelWrapper.cs)	(revision 686)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs	(.../DamPipingSellmeijer4ForcesKernelWrapper.cs)	(revision 687)
@@ -145,13 +145,17 @@
         /// <exception cref="NoNullAllowedException">No input object defined</exception>
         public void Execute(IKernelDataInput kernelDataInput, IKernelDataOutput kernelDataOutput, out List<LogMessage> messages)
         {
-            DamPipingSellmeijer4ForcesOutput damPipingOutput = (DamPipingSellmeijer4ForcesOutput) kernelDataOutput;
-            damPipingOutput.FoSp = defaultMaxReturnValue;
             DamPipingSellmeijer4ForcesInput damPipingInput = kernelDataInput as DamPipingSellmeijer4ForcesInput;
             if (damPipingInput == null)
             {
                 throw new NoNullAllowedException(Resources.DamPipingSellmeijer4ForcesKernelWrapper_NoInputObjectDefinedForSellmeijer4Forces);
             }
+            DamPipingSellmeijer4ForcesOutput damPipingOutput = (DamPipingSellmeijer4ForcesOutput)kernelDataOutput;
+            if (damPipingOutput == null)
+            {
+                throw new NoNullAllowedException(Resources.DamPipingSellmeijer4ForcesKernelWrapper_NoInputObjectDefinedForSellmeijer4Forces);
+            }
+            damPipingOutput.FoSp = defaultMaxReturnValue;
             messages = new List<LogMessage>();
             if (damPipingOutput.UpliftSituation.IsUplift)
             {