Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/PresentationObjects/DesignWaterLevelCalculationsContext.cs
===================================================================
diff -u -r72ec3a0d168944ed9625ac807af2757ca29cebfc -r000e2e3ed5b8ac248fe590b14c9c46811d0ab5f7
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/PresentationObjects/DesignWaterLevelCalculationsContext.cs	(.../DesignWaterLevelCalculationsContext.cs)	(revision 72ec3a0d168944ed9625ac807af2757ca29cebfc)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/PresentationObjects/DesignWaterLevelCalculationsContext.cs	(.../DesignWaterLevelCalculationsContext.cs)	(revision 000e2e3ed5b8ac248fe590b14c9c46811d0ab5f7)
@@ -31,7 +31,7 @@
     /// Presentation object for all data required to configure an enumeration of <see cref="HydraulicBoundaryLocationCalculation"/>
     /// with a design water level calculation result.
     /// </summary>
-    public class DesignWaterLevelCalculationsContext : ObservableWrappedObjectContextBase<ObservableList<HydraulicBoundaryLocationCalculation>>
+    public class DesignWaterLevelCalculationsContext : ObservableWrappedObjectContextBase<IObservableEnumerable<HydraulicBoundaryLocationCalculation>>
     {
         /// <summary>
         /// Creates a new instance of <see cref="DesignWaterLevelCalculationsContext"/>.
@@ -43,7 +43,7 @@
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="wrappedData"/>, <paramref name="assessmentSection"/> or
         /// <paramref name="getNormFunc"/> is <c>null</c>.</exception>
         /// <exception cref="ArgumentException">Thrown when <paramref name="categoryBoundaryName"/> is <c>null</c> or empty.</exception>
-        public DesignWaterLevelCalculationsContext(ObservableList<HydraulicBoundaryLocationCalculation> wrappedData,
+        public DesignWaterLevelCalculationsContext(IObservableEnumerable<HydraulicBoundaryLocationCalculation> wrappedData,
                                                    IAssessmentSection assessmentSection,
                                                    Func<double> getNormFunc,
                                                    string categoryBoundaryName)
@@ -84,7 +84,7 @@
         /// </summary>
         public string CategoryBoundaryName { get; }
 
-        public override bool Equals(WrappedObjectContextBase<ObservableList<HydraulicBoundaryLocationCalculation>> other)
+        public override bool Equals(WrappedObjectContextBase<IObservableEnumerable<HydraulicBoundaryLocationCalculation>> other)
         {
             return base.Equals(other)
                    && other is DesignWaterLevelCalculationsContext
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PresentationObjects/DesignWaterLevelCalculationsContextTest.cs
===================================================================
diff -u -rf8f82b94a5b6a3a47b2b32fc1a8ab704b33f356b -r000e2e3ed5b8ac248fe590b14c9c46811d0ab5f7
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PresentationObjects/DesignWaterLevelCalculationsContextTest.cs	(.../DesignWaterLevelCalculationsContextTest.cs)	(revision f8f82b94a5b6a3a47b2b32fc1a8ab704b33f356b)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PresentationObjects/DesignWaterLevelCalculationsContextTest.cs	(.../DesignWaterLevelCalculationsContextTest.cs)	(revision 000e2e3ed5b8ac248fe590b14c9c46811d0ab5f7)
@@ -54,7 +54,7 @@
                                                                   categoryBoundaryName);
 
             // Assert
-            Assert.IsInstanceOf<ObservableWrappedObjectContextBase<ObservableList<HydraulicBoundaryLocationCalculation>>>(context);
+            Assert.IsInstanceOf<ObservableWrappedObjectContextBase<IObservableEnumerable<HydraulicBoundaryLocationCalculation>>>(context);
             Assert.AreSame(calculations, context.WrappedData);
             Assert.AreSame(assessmentSection, context.AssessmentSection);
             Assert.AreSame(getNormFunc, context.GetNormFunc);
@@ -141,7 +141,7 @@
 
             private static readonly IAssessmentSection assessmentSection = mocks.Stub<IAssessmentSection>();
             private static readonly Func<double> getNormFunc = () => 0.01;
-            private static readonly ObservableList<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations = new ObservableList<HydraulicBoundaryLocationCalculation>();
+            private static readonly IObservableEnumerable<HydraulicBoundaryLocationCalculation> hydraulicBoundaryLocationCalculations = new ObservableList<HydraulicBoundaryLocationCalculation>();
             private static readonly string categoryBoundaryName = "Test name";
 
             [SetUp]
@@ -184,7 +184,7 @@
 
         private class DerivedDesignWaterLevelCalculationsContext : DesignWaterLevelCalculationsContext
         {
-            public DerivedDesignWaterLevelCalculationsContext(ObservableList<HydraulicBoundaryLocationCalculation> wrappedData,
+            public DerivedDesignWaterLevelCalculationsContext(IObservableEnumerable<HydraulicBoundaryLocationCalculation> wrappedData,
                                                               IAssessmentSection assessmentSection,
                                                               Func<double> getNormFunc,
                                                               string categoryBoundaryName)