Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs
===================================================================
diff -u -r3c832ffce74b527eb1d588aa722840f0a80330b7 -rf3f759a0fe398c51ec150ce6d96ffefcf0110eee
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision 3c832ffce74b527eb1d588aa722840f0a80330b7)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision f3f759a0fe398c51ec150ce6d96ffefcf0110eee)
@@ -256,7 +256,7 @@
         {
             get
             {
-                return data.WrappedData.PiezometricHeadExit;
+                return new DerivedPipingInput(data.WrappedData).PiezometricHeadExit;
             }
         }