Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/StochasticSoilModelCollection.cs
===================================================================
diff -u -r8eb717ca45b6518cccfef85e481e0da52ce1df4e -r66b07e7599319ea71ff109d8303f74a4a2e5f71c
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/StochasticSoilModelCollection.cs	(.../StochasticSoilModelCollection.cs)	(revision 8eb717ca45b6518cccfef85e481e0da52ce1df4e)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/StochasticSoilModelCollection.cs	(.../StochasticSoilModelCollection.cs)	(revision 66b07e7599319ea71ff109d8303f74a4a2e5f71c)
@@ -19,26 +19,19 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
-using System;
 using System.Collections.Generic;
-using System.Linq;
 using Core.Common.Base;
 
 namespace Ringtoets.Piping.Data
 {
     /// <summary>
     /// A collection of <see cref="StochasticSoilModel"/>.
     /// </summary>
-    public class StochasticSoilModelCollection : ObservableCollectionWithSourcePath<StochasticSoilModel>
+    public class StochasticSoilModelCollection : ObservableUniqueItemCollectionWithSourcePath<StochasticSoilModel>
     {
         protected override void ValidateItems(IEnumerable<StochasticSoilModel> items)
         {
-            IEnumerable<IGrouping<string, StochasticSoilModel>> duplicates = items.GroupBy(m => m.Name).Where(g => g.Count() > 1);
-            if(duplicates.Any())
-            {
-                var names = string.Join(", ", duplicates.Select(g => g.First()));
-                throw new ArgumentException($@"Ondergrondmodellen moeten een unieke naam hebben. Gevonden dubbele namen: {names}.");
-            }
+            ValidateListOnDuplicateFeature(items, model => model.Name, "Ondergrondmodellen", "naam");
         }
     }
 }
\ No newline at end of file