Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs
===================================================================
diff -u -rc1a8483060230939462956b39133ea9fb074858a -rde2ec8c1edd63eff10e2bce318888b28d5042b35
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision c1a8483060230939462956b39133ea9fb074858a)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/AssessmentSection.cs	(.../AssessmentSection.cs)	(revision de2ec8c1edd63eff10e2bce318888b28d5042b35)
@@ -80,6 +80,7 @@
         private StrengthStabilityLengthwiseConstructionFailureMechanism strengthStabilityLengthwiseConstruction;
         private DuneErosionFailureMechanism duneErosion;
         private TechnicalInnovationFailureMechanism technicalInnovation;
+        private RoundedDouble failureProbabilityMarginFactor;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="AssessmentSection"/> class.
@@ -133,7 +134,7 @@
             technicalInnovation = new TechnicalInnovationFailureMechanism();
             OtherFailureMechanism = new OtherFailureMechanism();
 
-            FailureProbabilityMarginFactor = new RoundedDouble(2, 0.58);
+            failureProbabilityMarginFactor = new RoundedDouble(2);
 
             FailureMechanismContribution = new FailureMechanismContribution(lowerLimitNorm, signalingNorm);
             ChangeComposition(composition);
@@ -471,7 +472,17 @@
         /// <summary>
         /// Gets the failure probability margin factor.
         /// </summary>
-        public RoundedDouble FailureProbabilityMarginFactor { get; }
+        public RoundedDouble FailureProbabilityMarginFactor
+        {
+            get
+            {
+                return failureProbabilityMarginFactor;
+            }
+            private set
+            {
+                failureProbabilityMarginFactor = value.ToPrecision(failureProbabilityMarginFactor.NumberOfDecimalPlaces);
+            }
+        }
 
         public IObservableEnumerable<HydraulicBoundaryLocationCalculation> WaterLevelCalculationsForFactorizedSignalingNorm
         {
@@ -656,6 +667,7 @@
                     StabilityPointStructures.Contribution = 2;
                     DuneErosion.Contribution = 0;
                     OtherFailureMechanism.Contribution = 30;
+                    FailureProbabilityMarginFactor = (RoundedDouble) 0.58;
                     break;
                 case AssessmentSectionComposition.Dune:
                     Piping.Contribution = 0;
@@ -671,6 +683,7 @@
                     StabilityPointStructures.Contribution = 0;
                     DuneErosion.Contribution = 70;
                     OtherFailureMechanism.Contribution = 30;
+                    FailureProbabilityMarginFactor = (RoundedDouble) 0;
                     break;
                 case AssessmentSectionComposition.DikeAndDune:
                     Piping.Contribution = 24;
@@ -686,6 +699,7 @@
                     StabilityPointStructures.Contribution = 2;
                     DuneErosion.Contribution = 10;
                     OtherFailureMechanism.Contribution = 20;
+                    FailureProbabilityMarginFactor = (RoundedDouble) 0.58;
                     break;
                 default:
                     throw new NotSupportedException();
Index: Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs
===================================================================
diff -u -rc1a8483060230939462956b39133ea9fb074858a -rde2ec8c1edd63eff10e2bce318888b28d5042b35
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs	(.../AssessmentSectionTest.cs)	(revision c1a8483060230939462956b39133ea9fb074858a)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/AssessmentSectionTest.cs	(.../AssessmentSectionTest.cs)	(revision de2ec8c1edd63eff10e2bce318888b28d5042b35)
@@ -119,8 +119,7 @@
             CollectionAssert.IsEmpty(assessmentSection.WaveHeightCalculationsForLowerLimitNorm);
             CollectionAssert.IsEmpty(assessmentSection.WaveHeightCalculationsForFactorizedLowerLimitNorm);
 
-            Assert.AreEqual(0.58, assessmentSection.FailureProbabilityMarginFactor.Value);
-            Assert.AreEqual(2, assessmentSection.FailureProbabilityMarginFactor.NumberOfDecimalPlaces);
+            AssertFailureProbabilityMarginFactor(composition, assessmentSection);
         }
 
         [Test]
@@ -350,6 +349,7 @@
             Assert.AreEqual(relevancies[8], assessmentSection.StabilityPointStructures.IsRelevant);
             Assert.AreEqual(relevancies[9], assessmentSection.PipingStructure.IsRelevant);
             Assert.AreEqual(relevancies[10], assessmentSection.DuneErosion.IsRelevant);
+            AssertFailureProbabilityMarginFactor(composition, assessmentSection);
         }
 
         [Test]
@@ -471,7 +471,7 @@
             var assessmentSection = new AssessmentSection(random.NextEnumValue<AssessmentSectionComposition>());
             var hydraulicBoundaryLocation1 = new TestHydraulicBoundaryLocation();
             var hydraulicBoundaryLocation2 = new TestHydraulicBoundaryLocation();
-            var hydraulicBoundaryLocations = new[]
+            TestHydraulicBoundaryLocation[] hydraulicBoundaryLocations =
             {
                 hydraulicBoundaryLocation1,
                 hydraulicBoundaryLocation2
@@ -521,22 +521,18 @@
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(call, "De contributie van het nieuwe toetsspoor moet gelijk zijn aan het oude toetsspoor.");
         }
 
-        private static IFailureMechanism[] GetExpectedContributingFailureMechanisms(AssessmentSection section)
+        private static void AssertFailureProbabilityMarginFactor(AssessmentSectionComposition composition, AssessmentSection assessmentSection)
         {
-            return new IFailureMechanism[]
+            Assert.AreEqual(2, assessmentSection.FailureProbabilityMarginFactor.NumberOfDecimalPlaces);
+
+            if (composition == AssessmentSectionComposition.Dune)
             {
-                section.Piping,
-                section.GrassCoverErosionInwards,
-                section.MacroStabilityInwards,
-                section.StabilityStoneCover,
-                section.WaveImpactAsphaltCover,
-                section.GrassCoverErosionOutwards,
-                section.HeightStructures,
-                section.ClosingStructures,
-                section.PipingStructure,
-                section.StabilityPointStructures,
-                section.DuneErosion
-            };
+                Assert.AreEqual(0, assessmentSection.FailureProbabilityMarginFactor.Value);
+            }
+            else
+            {
+                Assert.AreEqual(0.58, assessmentSection.FailureProbabilityMarginFactor.Value);
+            }
         }
 
         private static void AssertExpectedContributions(AssessmentSectionComposition composition, AssessmentSection assessmentSection)