Index: Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelIllustrationPointBase.cs
===================================================================
diff -u -rf935f1251aa545c93e116c9ec0c16a3587f882e2 -r2a88a3e4469b6b59db4ca9ff874cf69804c9393e
--- Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelIllustrationPointBase.cs	(.../TopLevelIllustrationPointBase.cs)	(revision f935f1251aa545c93e116c9ec0c16a3587f882e2)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelIllustrationPointBase.cs	(.../TopLevelIllustrationPointBase.cs)	(revision 2a88a3e4469b6b59db4ca9ff874cf69804c9393e)
@@ -61,7 +61,7 @@
         /// </summary>
         public string ClosingSituation { get; }
 
-        public object Clone()
+        public virtual object Clone()
         {
             var clone = (TopLevelIllustrationPointBase) MemberwiseClone();
 
Index: Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelSubMechanismIllustrationPoint.cs
===================================================================
diff -u -rd16d146d545cf86ad58c5e2c73cb5bc1b784ce67 -r2a88a3e4469b6b59db4ca9ff874cf69804c9393e
--- Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelSubMechanismIllustrationPoint.cs	(.../TopLevelSubMechanismIllustrationPoint.cs)	(revision d16d146d545cf86ad58c5e2c73cb5bc1b784ce67)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/IllustrationPoints/TopLevelSubMechanismIllustrationPoint.cs	(.../TopLevelSubMechanismIllustrationPoint.cs)	(revision 2a88a3e4469b6b59db4ca9ff874cf69804c9393e)
@@ -52,6 +52,15 @@
         /// <summary>
         /// Gets the sub mechanism illustration point.
         /// </summary>
-        public SubMechanismIllustrationPoint SubMechanismIllustrationPoint { get; }
+        public SubMechanismIllustrationPoint SubMechanismIllustrationPoint { get; private set; }
+
+        public override object Clone()
+        {
+            var clone = (TopLevelSubMechanismIllustrationPoint) base.Clone();
+
+            clone.SubMechanismIllustrationPoint = (SubMechanismIllustrationPoint) SubMechanismIllustrationPoint.Clone();
+
+            return clone;
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/IllustrationPoints/TopLevelSubMechanismIllustrationPointTest.cs
===================================================================
diff -u -r0913b25b262329fc46c40cc84e4c127dae21b85f -r2a88a3e4469b6b59db4ca9ff874cf69804c9393e
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/IllustrationPoints/TopLevelSubMechanismIllustrationPointTest.cs	(.../TopLevelSubMechanismIllustrationPointTest.cs)	(revision 0913b25b262329fc46c40cc84e4c127dae21b85f)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/IllustrationPoints/TopLevelSubMechanismIllustrationPointTest.cs	(.../TopLevelSubMechanismIllustrationPointTest.cs)	(revision 2a88a3e4469b6b59db4ca9ff874cf69804c9393e)
@@ -23,6 +23,8 @@
 using NUnit.Framework;
 using Ringtoets.Common.Data.IllustrationPoints;
 using Ringtoets.Common.Data.TestUtil.IllustrationPoints;
+using CoreCloneAssert = Core.Common.Data.TestUtil.CloneAssert;
+using CommonCloneAssert = Ringtoets.Common.Data.TestUtil.CloneAssert;
 
 namespace Ringtoets.Common.Data.Test.IllustrationPoints
 {
@@ -89,10 +91,24 @@
 
             // Assert
             Assert.IsInstanceOf<TopLevelIllustrationPointBase>(windDirectionClosingScenarioIllustrationPoint);
-
             Assert.AreEqual(closingScenario, windDirectionClosingScenarioIllustrationPoint.ClosingSituation);
             Assert.AreSame(windDirection, windDirectionClosingScenarioIllustrationPoint.WindDirection);
             Assert.AreSame(submechanismIllustrationPoint, windDirectionClosingScenarioIllustrationPoint.SubMechanismIllustrationPoint);
         }
+
+        [Test]
+        public void Clone_Always_ReturnNewInstanceWithCopiedValues()
+        {
+            // Setup
+            var original = new TopLevelSubMechanismIllustrationPoint(WindDirectionTestFactory.CreateTestWindDirection(),
+                                                                     "Random closing situation",
+                                                                     new TestSubMechanismIllustrationPoint());
+
+            // Call
+            object clone = original.Clone();
+
+            // Assert
+            CoreCloneAssert.AreClones(original, clone, CommonCloneAssert.AreClones);
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CloneAssert.cs
===================================================================
diff -u -r08c14e6427740dd913ec90e67b39b90eae396f8d -r2a88a3e4469b6b59db4ca9ff874cf69804c9393e
--- Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CloneAssert.cs	(.../CloneAssert.cs)	(revision 08c14e6427740dd913ec90e67b39b90eae396f8d)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CloneAssert.cs	(.../CloneAssert.cs)	(revision 2a88a3e4469b6b59db4ca9ff874cf69804c9393e)
@@ -141,6 +141,20 @@
         /// <param name="clone">The cloned object.</param>
         /// <exception cref="AssertionException">Thrown when <paramref name="original"/> and
         /// <paramref name="clone"/> are not clones.</exception>
+        public static void AreClones(TopLevelSubMechanismIllustrationPoint original, TopLevelSubMechanismIllustrationPoint clone)
+        {
+            AreClones((TopLevelIllustrationPointBase)original, clone);
+            CoreCloneAssert.AreClones(original.SubMechanismIllustrationPoint, clone.SubMechanismIllustrationPoint, AreClones);
+        }
+
+        /// <summary>
+        /// Method that asserts whether <paramref name="original"/> and <paramref name="clone"/>
+        /// are clones.
+        /// </summary>
+        /// <param name="original">The original object.</param>
+        /// <param name="clone">The cloned object.</param>
+        /// <exception cref="AssertionException">Thrown when <paramref name="original"/> and
+        /// <paramref name="clone"/> are not clones.</exception>
         public static void AreClones(IllustrationPointResult original, IllustrationPointResult clone)
         {
             Assert.AreEqual(original.Description, clone.Description);