Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/PropertyClasses/ReferenceLineProperties.cs
===================================================================
diff -u -rbb7246a859710e284b10c855848be97b8bc0b463 -r558241ef9493905c11075a1408aa1d209678f5ff
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/PropertyClasses/ReferenceLineProperties.cs	(.../ReferenceLineProperties.cs)	(revision bb7246a859710e284b10c855848be97b8bc0b463)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/PropertyClasses/ReferenceLineProperties.cs	(.../ReferenceLineProperties.cs)	(revision 558241ef9493905c11075a1408aa1d209678f5ff)
@@ -35,26 +35,27 @@
 namespace Ringtoets.Integration.Forms.PropertyClasses
 {
     /// <summary>
-    /// ViewModel of <see cref="ReferenceLine"/> for properties panel.
+    /// ViewModel of a <see cref="ReferenceLine"/> in the <see cref="IAssessmentSection"/>
+    /// for properties panel.
     /// </summary>
-    public class ReferenceLineProperties : ObjectProperties<ReferenceLine>
+    public class ReferenceLineProperties : ObjectProperties<IAssessmentSection>
     {
         private const int lengthPropertyIndex = 1;
         private const int geometryPropertyIndex = 2;
 
         /// <summary>
         /// Creates a new instance of <see cref="ReferenceLineProperties"/>.
         /// </summary>
-        /// <param name="referenceLine">The <see cref="ReferenceLine"/> to show the properties for.</param>
-        /// <exception cref="ArgumentNullException">Thrown when <paramref name="referenceLine"/> is <c>null</c>.</exception>
-        public ReferenceLineProperties(ReferenceLine referenceLine)
+        /// <param name="assessmentSection">The assessment section to show the reference line properties for.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/> is <c>null</c>.</exception>
+        public ReferenceLineProperties(IAssessmentSection assessmentSection)
         {
-            if (referenceLine == null)
+            if (assessmentSection == null)
             {
-                throw new ArgumentNullException(nameof(referenceLine));
+                throw new ArgumentNullException(nameof(assessmentSection));
             }
 
-            Data = referenceLine;
+            Data = assessmentSection;
         }
 
         [PropertyOrder(lengthPropertyIndex)]
@@ -65,7 +66,7 @@
         {
             get
             {
-                return new RoundedDouble(2, data.Length);
+                return new RoundedDouble(2, data.ReferenceLine.Length);
             }
         }
 
@@ -78,7 +79,7 @@
         {
             get
             {
-                return data.Points.ToArray();
+                return data.ReferenceLine.Points.ToArray();
             }
         }
     }
Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs
===================================================================
diff -u -rf730cc647492866c7c77b96c9e44b0bd4208142c -r558241ef9493905c11075a1408aa1d209678f5ff
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision f730cc647492866c7c77b96c9e44b0bd4208142c)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 558241ef9493905c11075a1408aa1d209678f5ff)
@@ -365,7 +365,7 @@
             };
             yield return new PropertyInfo<ReferenceLineContext, ReferenceLineProperties>
             {
-                CreateInstance = context => new ReferenceLineProperties(context.WrappedData.ReferenceLine)
+                CreateInstance = context => new ReferenceLineProperties(context.WrappedData)
             };
         }
 
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PropertyClasses/ReferenceLinePropertiesTest.cs
===================================================================
diff -u -rbb7246a859710e284b10c855848be97b8bc0b463 -r558241ef9493905c11075a1408aa1d209678f5ff
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PropertyClasses/ReferenceLinePropertiesTest.cs	(.../ReferenceLinePropertiesTest.cs)	(revision bb7246a859710e284b10c855848be97b8bc0b463)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/PropertyClasses/ReferenceLinePropertiesTest.cs	(.../ReferenceLinePropertiesTest.cs)	(revision 558241ef9493905c11075a1408aa1d209678f5ff)
@@ -27,6 +27,7 @@
 using Core.Common.Gui.PropertyBag;
 using Core.Common.TestUtil;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Integration.Forms.PropertyClasses;
@@ -37,60 +38,73 @@
     public class ReferenceLinePropertiesTest
     {
         [Test]
-        public void Constructor_ReferenceLineNull_ThrowsArgumentNullException()
+        public void Constructor_AssessmentSectionNull_ThrowsArgumentNullException()
         {
             // Call
             TestDelegate call = () => new ReferenceLineProperties(null);
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
-            Assert.AreEqual("referenceLine", paramName);
+            Assert.AreEqual("assessmentSection", paramName);
         }
 
         [Test]
-        public void Constructor_WithReferenceLine_ExpectedValues()
+        public void Constructor_WithAssessmentSection_ExpectedValues()
         {
             // Setup
-            var referenceLine = new ReferenceLine();
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            assessmentSection.ReferenceLine = new ReferenceLine();
+            mocks.ReplayAll();
 
             // Call
-            var properties = new ReferenceLineProperties(referenceLine);
+            var properties = new ReferenceLineProperties(assessmentSection);
 
             // Assert
-            Assert.IsInstanceOf<ObjectProperties<ReferenceLine>>(properties);
+            Assert.IsInstanceOf<ObjectProperties<IAssessmentSection>>(properties);
             TestHelper.AssertTypeConverter<ReferenceLineProperties, ExpandableArrayConverter>(
                 nameof(ReferenceLineProperties.Geometry));
 
-            Assert.AreSame(referenceLine, properties.Data);
+            Assert.AreSame(assessmentSection, properties.Data);
+            mocks.VerifyAll();
         }
 
         [Test]
         public void GetProperties_WithData_ReturnExpectedValues()
         {
             // Setup
             var random = new Random(39);
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
             var referenceLine = new ReferenceLine();
             var geometry = new List<Point2D>
             {
                 new Point2D(random.NextDouble(), random.NextDouble()),
                 new Point2D(random.NextDouble(), random.NextDouble())
             };
             referenceLine.SetGeometry(geometry);
+            assessmentSection.ReferenceLine = referenceLine;
+            mocks.ReplayAll();
 
-            var properties = new ReferenceLineProperties(referenceLine);
+            var properties = new ReferenceLineProperties(assessmentSection);
 
             // Call & Assert
             Assert.AreEqual(2, properties.Length.NumberOfDecimalPlaces);
             Assert.AreEqual(referenceLine.Length, properties.Length, properties.Length.GetAccuracy());
             CollectionAssert.AreEqual(geometry, properties.Geometry);
+            mocks.VerifyAll();
         }
 
         [Test]
         public void Constructor_ValidData_PropertiesHaveExpectedAttributeValues()
         {
             // Call
-            var properties = new ReferenceLineProperties(new ReferenceLine());
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
 
+            var properties = new ReferenceLineProperties(assessmentSection);
+
             // Assert
             PropertyDescriptorCollection dynamicProperties = PropertiesTestHelper.GetAllVisiblePropertyDescriptors(properties);
 
@@ -109,8 +123,10 @@
             PropertiesTestHelper.AssertRequiredPropertyDescriptorProperties(geometryProperty,
                                                                             generalCategoryName,
                                                                             "Coördinaten",
-                                                                            "Lijst van alle coördinaten (X-coördinaat, Y-coördinaat) die samen de referentielijn vormen.",
+                                                                            "Lijst van alle coördinaten (X-coördinaat, Y-coördinaat) " +
+                                                                            "die samen de referentielijn vormen.",
                                                                             true);
+            mocks.VerifyAll();
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/PropertyInfos/ReferenceLinePropertyInfoTest.cs
===================================================================
diff -u -r8c7c25ee0b61c182e38073f56cb6376c511ccbf2 -r558241ef9493905c11075a1408aa1d209678f5ff
--- Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/PropertyInfos/ReferenceLinePropertyInfoTest.cs	(.../ReferenceLinePropertyInfoTest.cs)	(revision 8c7c25ee0b61c182e38073f56cb6376c511ccbf2)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/PropertyInfos/ReferenceLinePropertyInfoTest.cs	(.../ReferenceLinePropertyInfoTest.cs)	(revision 558241ef9493905c11075a1408aa1d209678f5ff)
@@ -71,7 +71,7 @@
 
             // Assert
             Assert.IsInstanceOf<ReferenceLineProperties>(objectProperties);
-            Assert.AreSame(context.WrappedData.ReferenceLine, objectProperties.Data);
+            Assert.AreSame(context.WrappedData, objectProperties.Data);
         }
     }
 }
\ No newline at end of file