Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs
===================================================================
diff -u -r62e47f0904c38e013615cd2c5b0c57b9b567593c -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision 62e47f0904c38e013615cd2c5b0c57b9b567593c)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -566,7 +566,6 @@
             {
                 referenceLine = value;
                 double sectionLength = value?.Length ?? double.NaN;
-                MacroStabilityOutwards.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength = sectionLength;
                 WaveImpactAsphaltCover.GeneralWaveImpactAsphaltCoverInput.SectionLength = sectionLength;
             }
         }
Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactory.cs	(.../MacroStabilityOutwardsFailureMechanismAssemblyFactory.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactory.cs	(.../MacroStabilityOutwardsFailureMechanismAssemblyFactory.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -112,7 +112,7 @@
             try
             {
                 double n = failureMechanism.MacroStabilityOutwardsProbabilityAssessmentInput.GetN(
-                    failureMechanism.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength);
+                    assessmentSection.ReferenceLine.Length);
 
                 return calculator.AssembleDetailedAssessment(
                     failureMechanismSectionResult.DetailedAssessmentResult,
Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs
===================================================================
diff -u -r45ccc719b2acf50fa50cf7f790ebb7dceb41e28c -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 45ccc719b2acf50fa50cf7f790ebb7dceb41e28c)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -1880,7 +1880,7 @@
             {
                 new MacroStabilityOutwardsAssemblyCategoriesContext(nodeData,
                                                                     assessmentSection,
-                                                                    () => probabilityAssessmentInput.GetN(probabilityAssessmentInput.SectionLength)),
+                                                                    () => probabilityAssessmentInput.GetN(assessmentSection.ReferenceLine.Length)),
                 new ProbabilityFailureMechanismSectionResultContext<MacroStabilityOutwardsFailureMechanismSectionResult>(
                     nodeData.SectionResults, nodeData, assessmentSection),
                 nodeData.OutputComments
Index: Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs	(.../AssessmentSectionTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs	(.../AssessmentSectionTest.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -99,9 +99,6 @@
 
             AssertExpectedContributions(composition, assessmentSection);
 
-            Assert.AreEqual(double.NaN, assessmentSection.Piping.PipingProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(double.NaN, assessmentSection.MacroStabilityInwards.MacroStabilityInwardsProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(double.NaN, assessmentSection.MacroStabilityOutwards.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength);
             Assert.AreEqual(double.NaN, assessmentSection.WaveImpactAsphaltCover.GeneralWaveImpactAsphaltCoverInput.SectionLength);
 
             Assert.IsTrue(assessmentSection.BackgroundData.IsVisible);
@@ -389,9 +386,6 @@
             assessmentSection.ReferenceLine = referenceLine;
 
             // Assert
-            Assert.AreEqual(referenceLine.Length, assessmentSection.Piping.PipingProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(referenceLine.Length, assessmentSection.MacroStabilityInwards.MacroStabilityInwardsProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(referenceLine.Length, assessmentSection.MacroStabilityOutwards.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength);
             Assert.AreEqual(referenceLine.Length, assessmentSection.WaveImpactAsphaltCover.GeneralWaveImpactAsphaltCoverInput.SectionLength);
         }
 
@@ -406,9 +400,6 @@
             assessmentSection.ReferenceLine = null;
 
             // Assert
-            Assert.AreEqual(double.NaN, assessmentSection.Piping.PipingProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(double.NaN, assessmentSection.MacroStabilityInwards.MacroStabilityInwardsProbabilityAssessmentInput.SectionLength);
-            Assert.AreEqual(double.NaN, assessmentSection.MacroStabilityOutwards.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength);
             Assert.AreEqual(double.NaN, assessmentSection.WaveImpactAsphaltCover.GeneralWaveImpactAsphaltCoverInput.SectionLength);
         }
 
Index: Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../MacroStabilityOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/AssemblyFactories/MacroStabilityOutwardsFailureMechanismAssemblyFactoryTest.cs	(.../MacroStabilityOutwardsFailureMechanismAssemblyFactoryTest.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -219,7 +219,7 @@
 
                 Assert.AreEqual(assessmentSection.FailureMechanismContribution.Norm, calculator.DetailedAssessmentNormativeNormInput);
                 double expectedN = failureMechanism.MacroStabilityOutwardsProbabilityAssessmentInput.GetN(
-                    failureMechanism.MacroStabilityOutwardsProbabilityAssessmentInput.SectionLength);
+                    assessmentSection.ReferenceLine.Length);
                 Assert.AreEqual(expectedN, calculator.DetailedAssessmentFailureMechanismNInput);
                 Assert.AreEqual(failureMechanism.Contribution / 100, calculator.DetailedAssessmentFailureMechanismContribution);
             }
Index: Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/Input/MacroStabilityOutwardsProbabilityAssessmentInputTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/Input/MacroStabilityOutwardsProbabilityAssessmentInputTest.cs	(.../MacroStabilityOutwardsProbabilityAssessmentInputTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/Input/MacroStabilityOutwardsProbabilityAssessmentInputTest.cs	(.../MacroStabilityOutwardsProbabilityAssessmentInputTest.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -38,7 +38,6 @@
             Assert.IsInstanceOf<ProbabilityAssessmentInput>(probabilityAssessmentInput);
             Assert.AreEqual(0.033, probabilityAssessmentInput.A);
             Assert.AreEqual(50, probabilityAssessmentInput.B);
-            Assert.IsNaN(probabilityAssessmentInput.SectionLength);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/TreeNodeInfos/MacroStabilityOutwardsFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -r2b7a4d261a11c943ea0f0081d45edea6252887cc -r4b37694736a8ccec603ce7f9b71e6c095186b25d
--- Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/TreeNodeInfos/MacroStabilityOutwardsFailureMechanismContextTreeNodeInfoTest.cs	(.../MacroStabilityOutwardsFailureMechanismContextTreeNodeInfoTest.cs)	(revision 2b7a4d261a11c943ea0f0081d45edea6252887cc)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Plugin.Test/TreeNodeInfos/MacroStabilityOutwardsFailureMechanismContextTreeNodeInfoTest.cs	(.../MacroStabilityOutwardsFailureMechanismContextTreeNodeInfoTest.cs)	(revision 4b37694736a8ccec603ce7f9b71e6c095186b25d)
@@ -187,7 +187,7 @@
 
                 failureMechanismAssemblyCategoriesContext.GetFailureMechanismSectionAssemblyCategoriesFunc();
                 MacroStabilityOutwardsProbabilityAssessmentInput probabilityAssessmentInput = failureMechanism.MacroStabilityOutwardsProbabilityAssessmentInput;
-                Assert.AreEqual(probabilityAssessmentInput.GetN(probabilityAssessmentInput.SectionLength), calculator.FailureMechanismN);
+                Assert.AreEqual(probabilityAssessmentInput.GetN(assessmentSection.ReferenceLine.Length), calculator.FailureMechanismN);
             }
 
             var failureMechanismResultsContext = (ProbabilityFailureMechanismSectionResultContext<MacroStabilityOutwardsFailureMechanismSectionResult>)