Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/FileImporters/HeightStructureReplaceDataStrategy.cs
===================================================================
diff -u -r1010d4569cd91ef8661e423e01f833e932180fd4 -ra940166534b3dd6e778de2e7c8e7e5241f3d3381
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/FileImporters/HeightStructureReplaceDataStrategy.cs	(.../HeightStructureReplaceDataStrategy.cs)	(revision 1010d4569cd91ef8661e423e01f833e932180fd4)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/FileImporters/HeightStructureReplaceDataStrategy.cs	(.../HeightStructureReplaceDataStrategy.cs)	(revision a940166534b3dd6e778de2e7c8e7e5241f3d3381)
@@ -45,13 +45,11 @@
         /// <param name="failureMechanism">The failure mechanism in which the height structures are updated.</param>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanism"/> is <c>null</c>.</exception>
         public HeightStructureReplaceDataStrategy(HeightStructuresFailureMechanism failureMechanism)
-            : base(failureMechanism) {}
+            : base(failureMechanism, failureMechanism?.HeightStructures) {}
 
-        public IEnumerable<IObservable> UpdateStructuresWithImportedData(StructureCollection<HeightStructure> targetDataCollection,
-                                                                         IEnumerable<HeightStructure> readStructures,
-                                                                         string sourceFilePath)
+        public IEnumerable<IObservable> UpdateStructuresWithImportedData(IEnumerable<HeightStructure> readStructures, string sourceFilePath)
         {
-            return ReplaceTargetCollectionWithImportedData(targetDataCollection, readStructures, sourceFilePath);
+            return ReplaceTargetCollectionWithImportedData(readStructures, sourceFilePath);
         }
 
         protected override IEnumerable<IObservable> ClearData()