Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismSection2aAssessmentResultExtensions.cs
===================================================================
diff -u -r56ec7114c4c96eeee4a1bb16d0ecac2bb10a49b8 -rb7f496624546731a31137ae48d73c92456b1fe1d
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismSection2aAssessmentResultExtensions.cs	(.../PipingFailureMechanismSection2aAssessmentResultExtensions.cs)	(revision 56ec7114c4c96eeee4a1bb16d0ecac2bb10a49b8)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanismSection2aAssessmentResultExtensions.cs	(.../PipingFailureMechanismSection2aAssessmentResultExtensions.cs)	(revision b7f496624546731a31137ae48d73c92456b1fe1d)
@@ -38,7 +38,8 @@
         /// </summary>
         /// <param name="pipingFailureMechanismSectionResult">The result to get the result for.</param>
         /// <param name="calculations">All calculations in the failure mechanism.</param>
-        public static double GetAssessmentLayerTwoA(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, IEnumerable<PipingCalculationScenario> calculations)
+        public static double GetAssessmentLayerTwoA(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult,
+            IEnumerable<PipingCalculationScenario> calculations)
         {
             var calculationScenarios = pipingFailureMechanismSectionResult
                 .GetCalculationScenarios(calculations)
@@ -55,7 +56,8 @@
         /// </summary>
         /// <param name="pipingFailureMechanismSectionResult">The result to get the result for.</param>
         /// <param name="calculations">All calculations in the failure mechanism.</param>
-        public static RoundedDouble GetTotalContribution(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, IEnumerable<PipingCalculationScenario> calculations)
+        public static RoundedDouble GetTotalContribution(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, 
+            IEnumerable<PipingCalculationScenario> calculations)
         {
             return (RoundedDouble) pipingFailureMechanismSectionResult
                                        .GetCalculationScenarios(calculations)
@@ -67,7 +69,8 @@
         /// </summary>
         /// <param name="pipingFailureMechanismSectionResult">The result to get the result for.</param>
         /// <param name="calculations">All calculations in the failure mechanism.</param>
-        public static IEnumerable<PipingCalculationScenario> GetCalculationScenarios(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, IEnumerable<PipingCalculationScenario> calculations)
+        public static IEnumerable<PipingCalculationScenario> GetCalculationScenarios(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, 
+            IEnumerable<PipingCalculationScenario> calculations)
         {
             var lineSegments = Math2D.ConvertLinePointsToLineSegments(pipingFailureMechanismSectionResult.Section.Points);
 
@@ -80,7 +83,10 @@
         /// </summary>
         /// <param name="pipingFailureMechanismSectionResult">The result to get the result for.</param>
         /// <param name="calculations">All calculations in the failure mechanism.</param>
-        public static CalculationScenarioStatus GetCalculationScenarioStatus(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, IEnumerable<PipingCalculationScenario> calculations)
+        /// <exception cref="InvalidEnumArgumentException">Thrown when any of the relevant calculations 
+        /// in <paramref name="pipingFailureMechanismSectionResult"/> has an invalid <see cref="CalculationScenarioStatus"/>.</exception>
+        public static CalculationScenarioStatus GetCalculationScenarioStatus(this PipingFailureMechanismSectionResult pipingFailureMechanismSectionResult, 
+            IEnumerable<PipingCalculationScenario> calculations)
         {
             bool failed = false;
             bool notCalculated = false;