Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs
===================================================================
diff -u -r8a952205c0aa9c6bdc64a721f44a8d145758904b -rc78424bb1212d0cb8a4ce7a20aeeb05c370b0631
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision 8a952205c0aa9c6bdc64a721f44a8d145758904b)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision c78424bb1212d0cb8a4ce7a20aeeb05c370b0631)
@@ -452,6 +452,9 @@
                     var activities = nodeData.Parent.HydraulicBoundaryDatabase.Locations.Select(hbl => CreateHydraRingActivity(nodeData.Parent, hbl, hlcdDirectory)).ToList();
 
                     ActivityProgressDialogRunner.Run(Gui.MainWindow, activities);
+
+                    nodeData.Parent.NotifyObservers();
+                    nodeData.NotifyObservers();
                 }
                 );
 
@@ -554,7 +557,6 @@
             if (output != null)
             {
                 hydraulicBoundaryLocation.DesignWaterLevel = output.Result;
-                hydraulicBoundaryLocation.NotifyObservers();
             }
             else
             {
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/TreeNodeInfos/HydraulicBoundaryDatabaseContextTreeNodeInfoTest.cs
===================================================================
diff -u -r4fb4979a04ef6e40548e3e247ac4b7fc11473fff -rc78424bb1212d0cb8a4ce7a20aeeb05c370b0631
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/TreeNodeInfos/HydraulicBoundaryDatabaseContextTreeNodeInfoTest.cs	(.../HydraulicBoundaryDatabaseContextTreeNodeInfoTest.cs)	(revision 4fb4979a04ef6e40548e3e247ac4b7fc11473fff)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/TreeNodeInfos/HydraulicBoundaryDatabaseContextTreeNodeInfoTest.cs	(.../HydraulicBoundaryDatabaseContextTreeNodeInfoTest.cs)	(revision c78424bb1212d0cb8a4ce7a20aeeb05c370b0631)
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Controls.TreeView;
 using Core.Common.Gui;
 using Core.Common.Gui.ContextMenu;
@@ -191,10 +192,14 @@
         }
 
         [Test]
-        public void GivenHydraulicBoundaryDatabaseWithNonExistingFilePath_WhenCalculatingAssessmentLevelFromContextMenu_ThenLogMessagesAddedAndPreviousOutputNotAffected()
+        public void GivenHydraulicBoundaryDatabaseWithNonExistingFilePath_WhenCalculatingAssessmentLevelFromContextMenu_ThenLogMessagesAddedPreviousOutputNotAffectedAndObserversNotified()
         {
             // Given
             var gui = mocks.DynamicMock<IGui>();
+
+            var assessmentSectionBaseObserver = mocks.StrictMock<IObserver>();
+            var hydraulicBoundaryDatabaseContextObserver = mocks.StrictMock<IObserver>();
+
             var mainWindow = mocks.DynamicMock<IMainWindow>();
             var treeViewControlMock = mocks.StrictMock<TreeViewControl>();
             var contextMenuRunAssessmentLevelCalculationsIndex = 3;
@@ -219,11 +224,16 @@
             };
             var hydraulicBoundaryDatabaseContext = new HydraulicBoundaryDatabaseContext(assessmentSectionBase);
 
+            assessmentSectionBaseObserver.Expect(o => o.UpdateObserver());
+            hydraulicBoundaryDatabaseContextObserver.Expect(o => o.UpdateObserver());
             gui.Expect(cmp => cmp.Get(hydraulicBoundaryDatabaseContext, treeViewControlMock)).Return(new CustomItemsOnlyContextMenuBuilder());
             gui.Expect(g => g.MainWindow).Return(mainWindow);
 
             mocks.ReplayAll();
 
+            assessmentSectionBase.Attach(assessmentSectionBaseObserver);
+            hydraulicBoundaryDatabaseContext.Attach(hydraulicBoundaryDatabaseContextObserver);
+
             plugin.Gui = gui;
 
             var contextMenuAdapter = info.ContextMenuStrip(hydraulicBoundaryDatabaseContext, null, treeViewControlMock);