Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs
===================================================================
diff -u -rd6d1b03ce8dc3c4e6bba565a85ea310f6196adea -re1a8e98d60853beefbdb8c84e70f14165680ad7b
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision d6d1b03ce8dc3c4e6bba565a85ea310f6196adea)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision e1a8e98d60853beefbdb8c84e70f14165680ad7b)
@@ -45,7 +45,7 @@
             PipingProbabilityAssessmentInput = new PipingProbabilityAssessmentInput();
             GeneralInput = new GeneralPipingInput();
             SurfaceLines = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
-            StochasticSoilModels = new ObservableCollectionWithSourcePath<StochasticSoilModel>();
+            StochasticSoilModels = new StochasticSoilModelCollection();
             CalculationsGroup = new CalculationGroup(RingtoetsCommonDataResources.FailureMechanism_Calculations_DisplayName, false);
 
             sectionResults = new List<PipingFailureMechanismSectionResult>();
@@ -67,7 +67,7 @@
         /// <summary>
         /// Gets the available stochastic soil models within the scope of the piping failure mechanism.
         /// </summary>
-        public ObservableCollectionWithSourcePath<StochasticSoilModel> StochasticSoilModels { get; }
+        public StochasticSoilModelCollection StochasticSoilModels { get; }
 
         /// <summary>
         /// Gets the general piping calculation input parameters that apply to each piping calculation.