Index: Ringtoets/Common/src/Ringtoets.Common.IO/ReferenceLineImporter.cs
===================================================================
diff -u -r63fbdd5525927fbf9d63925eef9da8e17a0d7b44 -rf01bfd8d4c0541a96d57071b397c39792a99da26
--- Ringtoets/Common/src/Ringtoets.Common.IO/ReferenceLineImporter.cs	(.../ReferenceLineImporter.cs)	(revision 63fbdd5525927fbf9d63925eef9da8e17a0d7b44)
+++ Ringtoets/Common/src/Ringtoets.Common.IO/ReferenceLineImporter.cs	(.../ReferenceLineImporter.cs)	(revision f01bfd8d4c0541a96d57071b397c39792a99da26)
@@ -92,9 +92,9 @@
             bool clearReferenceLineDependentData = false;
 
             var importTarget = (ReferenceLineContext)targetItem;
-            if (importTarget.Parent.ReferenceLine != null)
+            if (importTarget.WrappedData.ReferenceLine != null)
             {
-                clearReferenceLineDependentData = ConfirmImportOfReferenceLineToClearReferenceLineDependentData(importTarget.Parent);
+                clearReferenceLineDependentData = ConfirmImportOfReferenceLineToClearReferenceLineDependentData(importTarget.WrappedData);
             }
 
             if (ImportIsCancelled)
@@ -117,7 +117,7 @@
                 return false;
             }
 
-            AddReferenceLineToDataModel(importTarget.Parent, readResult.ImportedItems.First(), clearReferenceLineDependentData);
+            AddReferenceLineToDataModel(importTarget.WrappedData, readResult.ImportedItems.First(), clearReferenceLineDependentData);
             return true;
         }
 
@@ -189,8 +189,6 @@
                            2, clearReferenceLineDependentData ? 4 : 2);
             assessmentSection.ReferenceLine = importedReferenceLine;
 
-            changedObservables.Add(assessmentSection); // Note: Add assessmentSection to the list of changed observables. Otherwise only the reference line context item will be notified.
-
             if (clearReferenceLineDependentData && assessmentSection.GetFailureMechanisms() != null)
             {
                 ClearReferenceLineDependentData(assessmentSection);