Index: Riskeer/Integration/src/Riskeer.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs
===================================================================
diff -u -rc93ac2bdd64812a93293a7bf711ba9a9ba548a30 -rd25ce0c7ce3093fe47efe020396f83d5abd69ec0
--- Riskeer/Integration/src/Riskeer.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs	(.../AssessmentSectionMergeHandler.cs)	(revision c93ac2bdd64812a93293a7bf711ba9a9ba548a30)
+++ Riskeer/Integration/src/Riskeer.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs	(.../AssessmentSectionMergeHandler.cs)	(revision d25ce0c7ce3093fe47efe020396f83d5abd69ec0)
@@ -123,13 +123,14 @@
             return changedObjects;
         }
 
-        private static IEnumerable<IObservable> MergeProbabilities(ObservableList<HydraulicBoundaryLocationCalculationsForTargetProbability> userDefinedTargetProbabilities, HydraulicBoundaryLocationCalculationsForTargetProbability[] probabilitiesToMerge)
+        private static IEnumerable<IObservable> MergeProbabilities(IEnumerable<HydraulicBoundaryLocationCalculationsForTargetProbability> targetProbabilities,
+                                                                   IEnumerable<HydraulicBoundaryLocationCalculationsForTargetProbability> probabilitiesToMerge)
         {
             var changedObjects = new List<IObservable>();
 
             foreach (HydraulicBoundaryLocationCalculationsForTargetProbability probabilityToMerge in probabilitiesToMerge)
             {
-                HydraulicBoundaryLocationCalculationsForTargetProbability targetProbability = userDefinedTargetProbabilities.First(
+                HydraulicBoundaryLocationCalculationsForTargetProbability targetProbability = targetProbabilities.First(
                     c => c.TargetProbability.Equals(probabilityToMerge.TargetProbability));
 
                 changedObjects.AddRange(MergeHydraulicBoundaryLocationCalculations(targetProbability.HydraulicBoundaryLocationCalculations,
@@ -139,7 +140,9 @@
             return changedObjects;
         }
 
-        private static void MergeUniqueProbabilities(ObservableList<HydraulicBoundaryLocationCalculationsForTargetProbability> userDefinedTargetProbabilities, Func<IEnumerable<HydraulicBoundaryLocationCalculationsForTargetProbability>> getTargetProbabilities, IEnumerable<HydraulicBoundaryLocation> hydraulicBoundaryLocations)
+        private static void MergeUniqueProbabilities(ObservableList<HydraulicBoundaryLocationCalculationsForTargetProbability> targetProbabilities,
+                                                     Func<IEnumerable<HydraulicBoundaryLocationCalculationsForTargetProbability>> getTargetProbabilities,
+                                                     IEnumerable<HydraulicBoundaryLocation> hydraulicBoundaryLocations)
         {
             foreach (HydraulicBoundaryLocationCalculationsForTargetProbability targetProbability in getTargetProbabilities())
             {
@@ -151,7 +154,7 @@
                                                                                                          calculation.HydraulicBoundaryLocation, hydraulicBoundaryLocations)))
                                      .ToArray());
 
-                userDefinedTargetProbabilities.Add(newTargetProbability);
+                targetProbabilities.Add(newTargetProbability);
             }
         }