Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs
===================================================================
diff -u -r314545f25db70366badcc527aeca68d241bfdcdc -r8c60e937f4b8009fea80f3702879e100fe03b63f
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs	(.../PipingCalculation.cs)	(revision 314545f25db70366badcc527aeca68d241bfdcdc)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculation.cs	(.../PipingCalculation.cs)	(revision 8c60e937f4b8009fea80f3702879e100fe03b63f)
@@ -21,16 +21,15 @@
 
 using System;
 using Core.Common.Base;
-using Ringtoets.Common.Data;
-using Ringtoets.Common.Data.FailureMechanism;
+using Ringtoets.Common.Data.Calculation;
 using Ringtoets.Piping.Data.Properties;
 
 namespace Ringtoets.Piping.Data
 {
     /// <summary>
     /// This class holds the information which can be made visible in the graphical interface of the application.
     /// </summary>
-    public class PipingCalculation : Observable, ICalculationItem, ICalculation
+    public class PipingCalculation : Observable, ICalculation
     {
         /// <summary>
         /// Constructs a new instance of <see cref="PipingCalculation"/> with default values set for some of the parameters.