Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs
===================================================================
diff -u -r6961604966c692884a617414010e131915732469 -re57e79927485e44d681b0617f17bada42dbfb862
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision 6961604966c692884a617414010e131915732469)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
@@ -927,7 +927,7 @@
             entity.ReadCommonFailureMechanismProperties(failureMechanism, collector);
             entity.ReadDuneErosionMechanismSectionResults(failureMechanism, collector);
             entity.ReadGeneralDuneErosionInput(failureMechanism.GeneralInput);
-            entity.ReadDuneLocations(failureMechanism.DuneLocations, collector);
+            failureMechanism.SetDuneLocations(entity.ReadDuneLocations(collector));
         }
 
         private static void ReadGeneralDuneErosionInput(this FailureMechanismEntity entity, GeneralDuneErosionInput input)
@@ -948,14 +948,13 @@
             }
         }
 
-        private static void ReadDuneLocations(this FailureMechanismEntity entity,
-                                              List<DuneLocation> locations,
-                                              ReadConversionCollector collector)
+        private static IEnumerable<DuneLocation> ReadDuneLocations(this FailureMechanismEntity entity,
+                                                                   ReadConversionCollector collector)
         {
-            locations.AddRange(entity.DuneLocationEntities
+           return entity.DuneLocationEntities
                                      .OrderBy(location => location.Order)
                                      .Select(location => location.Read(collector))
-                                     .ToArray());
+                                     .ToArray();
         }
 
         #endregion