Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs
===================================================================
diff -u -r3fb0df0ed6e64657154700ee7706e035d5bf99f5 -rc1594afa56f02899bd122fc4fd4ccf4d76b236b7
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision 3fb0df0ed6e64657154700ee7706e035d5bf99f5)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/FailureMechanismEntityReadExtensions.cs	(.../FailureMechanismEntityReadExtensions.cs)	(revision c1594afa56f02899bd122fc4fd4ccf4d76b236b7)
@@ -35,6 +35,7 @@
 using Application.Ringtoets.Storage.Read.WaveImpactAsphaltCover;
 using Core.Common.Base;
 using Ringtoets.ClosingStructures.Data;
+using Ringtoets.Common.Data;
 using Ringtoets.Common.Data.Calculation;
 using Ringtoets.Common.Data.DikeProfiles;
 using Ringtoets.Common.Data.FailureMechanism;
@@ -247,7 +248,7 @@
             entity.ReadCommonFailureMechanismProperties(failureMechanism, collector);
             entity.ReadHeightStructuresMechanismSectionResults(failureMechanism, collector);
             entity.ReadForeshoreProfiles(failureMechanism.ForeshoreProfiles, collector);
-            entity.ReadHeightStructures(failureMechanism.HeightStructures, collector);
+            entity.ReadHeightStructures(failureMechanism.HeightStructuresCollection, collector);
             entity.ReadGeneralInput(failureMechanism.GeneralInput);
             ReadHeightStructuresRootCalculationGroup(entity.CalculationGroupEntity, failureMechanism.CalculationsGroup, collector);
         }
@@ -265,9 +266,10 @@
             }
         }
 
-        private static void ReadHeightStructures(this FailureMechanismEntity entity, ObservableList<HeightStructure> heightStructures, ReadConversionCollector collector)
+        private static void ReadHeightStructures(this FailureMechanismEntity entity, StructureCollection<HeightStructure> heightStructures, ReadConversionCollector collector)
         {
-            heightStructures.AddRange(entity.HeightStructureEntities.OrderBy(fpe => fpe.Order).Select(structureEntity => structureEntity.Read(collector)));
+            heightStructures.AddRange(entity.HeightStructureEntities.OrderBy(fpe => fpe.Order).Select(structureEntity => structureEntity.Read(collector)),
+                                      "TODO: To be determined");
         }
 
         private static void ReadGeneralInput(this FailureMechanismEntity entity, GeneralHeightStructuresInput generalInput)