Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs
===================================================================
diff -u -r3c7c387b79d1012285ee03512eb3977026ce6b2c -r8db05cd101eb4c968419bd9189fc129f3e11b941
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs	(.../AssessmentSectionMergeHandler.cs)	(revision 3c7c387b79d1012285ee03512eb3977026ce6b2c)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/Merge/AssessmentSectionMergeHandler.cs	(.../AssessmentSectionMergeHandler.cs)	(revision 8db05cd101eb4c968419bd9189fc129f3e11b941)
@@ -77,13 +77,19 @@
 
             BeforeMerge(targetAssessmentSection);
             MergeHydraulicBoundaryLocations(targetAssessmentSection, sourceAssessmentSection);
+            AfterMerge(targetAssessmentSection);
         }
 
         private void BeforeMerge(AssessmentSection assessmentSection)
         {
             viewCommands.RemoveAllViewsForItem(assessmentSection);
         }
 
+        private static void AfterMerge(AssessmentSection targetAssessmentSection)
+        {
+            targetAssessmentSection.NotifyObservers();
+        }
+
         private static void MergeHydraulicBoundaryLocations(AssessmentSection targetAssessmentSection, AssessmentSection sourceAssessmentSection)
         {
             MergeHydraulicBoundaryLocationCalculations(targetAssessmentSection.WaterLevelCalculationsForFactorizedSignalingNorm,