Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanismSectionResult.cs
===================================================================
diff -u -r673e35de0df920529e5dda63ea8b4dfb08ed65a8 -rd9c981f7b4c64d16e55fca0cb51eb9f4c9aec28f
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanismSectionResult.cs	(.../HeightStructuresFailureMechanismSectionResult.cs)	(revision 673e35de0df920529e5dda63ea8b4dfb08ed65a8)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanismSectionResult.cs	(.../HeightStructuresFailureMechanismSectionResult.cs)	(revision d9c981f7b4c64d16e55fca0cb51eb9f4c9aec28f)
@@ -30,17 +30,12 @@
     /// </summary>
     public class HeightStructuresFailureMechanismSectionResult : FailureMechanismSectionResult
     {
-        private readonly double assessmentLayerTwoA;
-
         /// <summary>
         /// Creates a new instance of <see cref="HeightStructuresFailureMechanismSectionResult"/>.
         /// </summary>
         /// <param name="section">The <see cref="FailureMechanismSection"/> to get the result from.</param>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="section"/> is <c>null</c>.</exception>
-        public HeightStructuresFailureMechanismSectionResult(FailureMechanismSection section) : base(section)
-        {
-            assessmentLayerTwoA = double.NaN;
-        }
+        public HeightStructuresFailureMechanismSectionResult(FailureMechanismSection section) : base(section) {}
 
         /// <summary>
         /// Gets the value of assessment layer two a.
@@ -49,7 +44,11 @@
         {
             get
             {
-                return assessmentLayerTwoA;
+                if (Calculation == null || !Calculation.HasOutput)
+                {
+                    return double.NaN;
+                }
+                return Calculation.Output.Probability;
             }
         }