Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Create/Piping/PipingFailureMechanismCreateExtensions.cs
===================================================================
diff -u -r01ff2c58c13df8f42661ae3e446dc2caaa94247e -r37aadd6a7b1a13ef1c8809b3479df0911c6632bb
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Create/Piping/PipingFailureMechanismCreateExtensions.cs	(.../PipingFailureMechanismCreateExtensions.cs)	(revision 01ff2c58c13df8f42661ae3e446dc2caaa94247e)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Create/Piping/PipingFailureMechanismCreateExtensions.cs	(.../PipingFailureMechanismCreateExtensions.cs)	(revision 37aadd6a7b1a13ef1c8809b3479df0911c6632bb)
@@ -75,17 +75,19 @@
 
         private static void AddEntitiesForStochasticSoilModels(PipingFailureMechanism mechanism, PersistenceRegistry registry, FailureMechanismEntity entity)
         {
+            int index = 0;
             foreach (var stochasticSoilModel in mechanism.StochasticSoilModels)
             {
-                entity.StochasticSoilModelEntities.Add(stochasticSoilModel.Create(registry));
+                entity.StochasticSoilModelEntities.Add(stochasticSoilModel.Create(registry, index++));
             }
         }
 
         private static void AddEntitiesForSurfaceLines(PipingFailureMechanism mechanism, PersistenceRegistry registry, FailureMechanismEntity entity)
         {
+            int index = 0;
             foreach (RingtoetsPipingSurfaceLine surfaceLine in mechanism.SurfaceLines)
             {
-                entity.SurfaceLineEntities.Add(surfaceLine.Create(registry));
+                entity.SurfaceLineEntities.Add(surfaceLine.Create(registry, index++));
             }
         }
     }