Index: Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/HydraulicBoundaryLocationCalculationsProperties.cs
===================================================================
diff -u -r46813455904b4f3292777b0e05458bbf3640d1a8 -r934f5e201c55b7bf13f970ec2d2e1eca635006f6
--- Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/HydraulicBoundaryLocationCalculationsProperties.cs	(.../HydraulicBoundaryLocationCalculationsProperties.cs)	(revision 46813455904b4f3292777b0e05458bbf3640d1a8)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/HydraulicBoundaryLocationCalculationsProperties.cs	(.../HydraulicBoundaryLocationCalculationsProperties.cs)	(revision 934f5e201c55b7bf13f970ec2d2e1eca635006f6)
@@ -29,23 +29,23 @@
     /// <summary>
     /// ViewModel of an enumeration of <see cref="HydraulicBoundaryLocationCalculation"/> for properties panel.
     /// </summary>
-    public abstract class HydraulicBoundaryLocationCalculationsProperties : ObjectProperties<ObservableList<HydraulicBoundaryLocationCalculation>>, IDisposable
+    public abstract class HydraulicBoundaryLocationCalculationsProperties : ObjectProperties<IObservableEnumerable<HydraulicBoundaryLocationCalculation>>, IDisposable
     {
-        private readonly RecursiveObserver<ObservableList<HydraulicBoundaryLocationCalculation>, HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculationsObserver;
+        private readonly RecursiveObserver<IObservableEnumerable<HydraulicBoundaryLocationCalculation>, HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculationsObserver;
 
         /// <summary>
         /// Creates a new instance of <see cref="HydraulicBoundaryLocationCalculationsProperties"/>.
         /// </summary>
-        /// <param name="hydraulicBoundaryLocationCalculations">The list of hydraulic boundary location calculations to set as data.</param>
+        /// <param name="hydraulicBoundaryLocationCalculations">The enumeration of hydraulic boundary location calculations to set as data.</param>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="hydraulicBoundaryLocationCalculations"/> is <c>null</c>.</exception>
-        protected HydraulicBoundaryLocationCalculationsProperties(ObservableList<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations)
+        protected HydraulicBoundaryLocationCalculationsProperties(IObservableEnumerable<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations)
         {
             if (hydraulicBoundaryLocationCalculations == null)
             {
                 throw new ArgumentNullException(nameof(hydraulicBoundaryLocationCalculations));
             }
 
-            hydraulicBoundaryLocationCalculationsObserver = new RecursiveObserver<ObservableList<HydraulicBoundaryLocationCalculation>, HydraulicBoundaryLocationCalculation>(OnRefreshRequired, list => list)
+            hydraulicBoundaryLocationCalculationsObserver = new RecursiveObserver<IObservableEnumerable<HydraulicBoundaryLocationCalculation>, HydraulicBoundaryLocationCalculation>(OnRefreshRequired, hblc => hblc)
             {
                 Observable = hydraulicBoundaryLocationCalculations
             };
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/HydraulicBoundaryLocationCalculationsPropertiesTest.cs
===================================================================
diff -u -r46813455904b4f3292777b0e05458bbf3640d1a8 -r934f5e201c55b7bf13f970ec2d2e1eca635006f6
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/HydraulicBoundaryLocationCalculationsPropertiesTest.cs	(.../HydraulicBoundaryLocationCalculationsPropertiesTest.cs)	(revision 46813455904b4f3292777b0e05458bbf3640d1a8)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/HydraulicBoundaryLocationCalculationsPropertiesTest.cs	(.../HydraulicBoundaryLocationCalculationsPropertiesTest.cs)	(revision 934f5e201c55b7bf13f970ec2d2e1eca635006f6)
@@ -53,7 +53,7 @@
             using (var properties = new TestHydraulicBoundaryLocationCalculationsProperties(hydraulicBoundaryLocationCalculations))
             {
                 // Assert
-                Assert.IsInstanceOf<ObjectProperties<ObservableList<HydraulicBoundaryLocationCalculation>>>(properties);
+                Assert.IsInstanceOf<ObjectProperties<IObservableEnumerable<HydraulicBoundaryLocationCalculation>>>(properties);
                 Assert.IsInstanceOf<IDisposable>(properties);
                 Assert.AreSame(hydraulicBoundaryLocationCalculations, properties.Data);
             }
@@ -109,7 +109,7 @@
 
         private class TestHydraulicBoundaryLocationCalculationsProperties : HydraulicBoundaryLocationCalculationsProperties
         {
-            public TestHydraulicBoundaryLocationCalculationsProperties(ObservableList<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations)
+            public TestHydraulicBoundaryLocationCalculationsProperties(IObservableEnumerable<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations)
                 : base(hydraulicBoundaryLocationCalculations) {}
         }
     }