Index: Core/Common/src/Core.Common.Base/IO/FileImporterBase.cs
===================================================================
diff -u -r8905298103eb01ce13dd5c1a2f267f879d4fda3e -rea9aa0d2c261d907476c5684e388b49aafb3fc15
--- Core/Common/src/Core.Common.Base/IO/FileImporterBase.cs	(.../FileImporterBase.cs)	(revision 8905298103eb01ce13dd5c1a2f267f879d4fda3e)
+++ Core/Common/src/Core.Common.Base/IO/FileImporterBase.cs	(.../FileImporterBase.cs)	(revision ea9aa0d2c261d907476c5684e388b49aafb3fc15)
@@ -70,11 +70,6 @@
 
         public virtual void DoPostImportUpdates()
         {
-            if (Canceled)
-            {
-                return;
-            }
-
             var observableTarget = ImportTarget as IObservable;
             if (observableTarget != null)
             {
Index: Core/Common/src/Core.Common.Base/IO/IFileImporter.cs
===================================================================
diff -u -r9063c3c60f936760953c52185b72f0cb2dce9bf8 -rea9aa0d2c261d907476c5684e388b49aafb3fc15
--- Core/Common/src/Core.Common.Base/IO/IFileImporter.cs	(.../IFileImporter.cs)	(revision 9063c3c60f936760953c52185b72f0cb2dce9bf8)
+++ Core/Common/src/Core.Common.Base/IO/IFileImporter.cs	(.../IFileImporter.cs)	(revision ea9aa0d2c261d907476c5684e388b49aafb3fc15)
@@ -47,8 +47,7 @@
         /// Notifies all observers of <see cref="IObservable"/> instances that have been
         /// changed during the import.
         /// </summary>
-        /// <remarks>This method should be called by caller who calls <see cref="Cancel"/>
-        /// on this importer.</remarks>
+        /// <remarks>This method should also be called when the import routine was canceled.</remarks>
         void DoPostImportUpdates();
     }
 }
\ No newline at end of file
Index: Core/Common/test/Core.Common.Base.Test/IO/FileImporterBaseTest.cs
===================================================================
diff -u -r49c5da81f49a23dd6e66526d264a08bf510e6963 -rea9aa0d2c261d907476c5684e388b49aafb3fc15
--- Core/Common/test/Core.Common.Base.Test/IO/FileImporterBaseTest.cs	(.../FileImporterBaseTest.cs)	(revision 49c5da81f49a23dd6e66526d264a08bf510e6963)
+++ Core/Common/test/Core.Common.Base.Test/IO/FileImporterBaseTest.cs	(.../FileImporterBaseTest.cs)	(revision ea9aa0d2c261d907476c5684e388b49aafb3fc15)
@@ -113,12 +113,14 @@
         }
 
         [Test]
-        public void DoPostImportUpdates_ImportCancelled_NoNotifyObserversCalled()
+        public void DoPostImportUpdates_ImportCancelled_NotifyObservers()
         {
             // Setup
             var mocks = new MockRepository();
             var observableInstance = mocks.StrictMock<IObservable>();
             var observableTarget = mocks.StrictMock<IObservable>();
+            observableInstance.Expect(o => o.NotifyObservers());
+            observableTarget.Expect(o => o.NotifyObservers());
             mocks.ReplayAll();
 
             var simpleImporter = new SimpleFileImporter<IObservable>(observableTarget)
@@ -134,7 +136,7 @@
             simpleImporter.DoPostImportUpdates();
 
             // Assert
-            mocks.VerifyAll(); // Assert no NotifyObservers were called
+            mocks.VerifyAll(); // Assert NotifyObservers is called
         }
 
         [Test]
Index: Ringtoets/Common/test/Ringtoets.Common.IO.Test/ReferenceLines/ReferenceLineImporterTest.cs
===================================================================
diff -u -rce9e1d476f00cfb42ce2a8ab6c762baf5abfd97b -rea9aa0d2c261d907476c5684e388b49aafb3fc15
--- Ringtoets/Common/test/Ringtoets.Common.IO.Test/ReferenceLines/ReferenceLineImporterTest.cs	(.../ReferenceLineImporterTest.cs)	(revision ce9e1d476f00cfb42ce2a8ab6c762baf5abfd97b)
+++ Ringtoets/Common/test/Ringtoets.Common.IO.Test/ReferenceLines/ReferenceLineImporterTest.cs	(.../ReferenceLineImporterTest.cs)	(revision ea9aa0d2c261d907476c5684e388b49aafb3fc15)
@@ -354,7 +354,7 @@
         }
 
         [Test]
-        public void DoPostImportUpdates_CancellingImport_DoNotNotifyObservers()
+        public void DoPostImportUpdates_CancellingImport_NotifyObservers()
         {
             // Setup
             var path = TestHelper.GetTestDataPath(TestDataPath.Ringtoets.Common.IO, "traject_10-2.shp");
@@ -365,6 +365,7 @@
             var assessmentSection = mocks.Stub<IAssessmentSection>();
             assessmentSection.ReferenceLine = originalReferenceLine;
             assessmentSection.Expect(section => section.Attach(contextObserver));
+            assessmentSection.Expect(section => section.NotifyObservers());
 
             var handler = mocks.StrictMock<IReferenceLineReplaceHandler>();
             handler.Expect(h => h.DoPostReplacementUpdates());
@@ -389,7 +390,7 @@
             importer.DoPostImportUpdates();
 
             // Assert
-            mocks.VerifyAll(); // Expect no NotifyObserver calls
+            mocks.VerifyAll(); // Expect NotifyObservers call
         }
 
         [Test]
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs
===================================================================
diff -u -rb7b12fd198046b1503194e07a37a7b4525b4c337 -rea9aa0d2c261d907476c5684e388b49aafb3fc15
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision b7b12fd198046b1503194e07a37a7b4525b4c337)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision ea9aa0d2c261d907476c5684e388b49aafb3fc15)
@@ -32,8 +32,6 @@
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Piping.IO.SurfaceLines;
 using Ringtoets.Piping.Primitives;
-using PipingFormsResources = Ringtoets.Piping.Forms.Properties.Resources;
-using PipingDataResources = Ringtoets.Piping.Data.Properties.Resources;
 using RingtoetsPluginResources = Ringtoets.Piping.Plugin.Properties.Resources;
 
 namespace Ringtoets.Piping.Plugin.FileImporter