Index: Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/ReferenceLine.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -rb19314cfde76821b6f296df07204e2590b98da3a
--- Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/ReferenceLine.cs	(.../ReferenceLine.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/ReferenceLine.cs	(.../ReferenceLine.cs)	(revision b19314cfde76821b6f296df07204e2590b98da3a)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using RingtoetsCommonDataResources = Ringtoets.Common.Data.Properties.Resources;
 
@@ -30,7 +31,7 @@
     /// <summary>
     /// Class representing the reference line used as a basis for assessment.
     /// </summary>
-    public class ReferenceLine
+    public class ReferenceLine : Observable
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="ReferenceLine"/> class with no coordinate points.
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/ReferenceLineTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -rb19314cfde76821b6f296df07204e2590b98da3a
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/ReferenceLineTest.cs	(.../ReferenceLineTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/ReferenceLineTest.cs	(.../ReferenceLineTest.cs)	(revision b19314cfde76821b6f296df07204e2590b98da3a)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using Core.Common.TestUtil;
 using NUnit.Framework;
@@ -31,12 +32,13 @@
     public class ReferenceLineTest
     {
         [Test]
-        public void DefaultConstructor_ExpectedValues()
+        public void Constructor_ExpectedValues()
         {
             // Call
             var referenceLine = new ReferenceLine();
 
             // Assert
+            Assert.IsInstanceOf<Observable>(referenceLine);
             CollectionAssert.IsEmpty(referenceLine.Points);
         }