Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs
===================================================================
diff -u -r17b11c850b35c3ea99150ba25098b5b769b58f4f -r07f3d67fe9512b3c8303ff09398b0a234900d546
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs	(.../PipingCalculation.cs)	(revision 17b11c850b35c3ea99150ba25098b5b769b58f4f)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs	(.../PipingCalculation.cs)	(revision 07f3d67fe9512b3c8303ff09398b0a234900d546)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Base;
 using Ringtoets.Common.Data;
 using Ringtoets.Common.Data.Calculation;
@@ -29,7 +30,7 @@
     /// <summary>
     /// This class holds information about a calculation for the <see cref="PipingFailureMechanism"/>.
     /// </summary>
-    public class PipingCalculation : Observable, ICalculation
+    public class PipingCalculation : CloneableObservable, ICalculation
     {
         /// <summary>
         /// Creates a new instance of <see cref="PipingCalculation"/> with default values set for some of the parameters.
@@ -77,9 +78,9 @@
             SemiProbabilisticOutput = null;
         }
 
-        public object Clone()
+        public override object Clone()
         {
-            var clone = (PipingCalculation) MemberwiseClone();
+            var clone = (PipingCalculation) base.Clone();
 
             clone.Comments = (Comment) Comments.Clone();
             clone.InputParameters = (PipingInput) InputParameters.Clone();