Index: Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculationInput.cs
===================================================================
diff -u -rb3b6c13cf736c134476b3db34281332d01ca86b1 -r1c474d80a340cff18ba177241f856edf5f13e434
--- Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculationInput.cs	(.../ICalculationInput.cs)	(revision b3b6c13cf736c134476b3db34281332d01ca86b1)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculationInput.cs	(.../ICalculationInput.cs)	(revision 1c474d80a340cff18ba177241f856edf5f13e434)
@@ -19,12 +19,13 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Base;
 
 namespace Ringtoets.Common.Data.Calculation
 {
     /// <summary>
     /// Interface describing an object that is the input to a <see cref="ICalculation"/>.
     /// </summary>
-    public interface ICalculationInput : IObservable {}
+    public interface ICalculationInput : IObservable, ICloneable {}
 }
\ No newline at end of file