Index: src/Deltares.DSoilModel.Data/SosSoilLayer1D.cs
===================================================================
diff -u -r631 -r672
--- src/Deltares.DSoilModel.Data/SosSoilLayer1D.cs	(.../SosSoilLayer1D.cs)	(revision 631)
+++ src/Deltares.DSoilModel.Data/SosSoilLayer1D.cs	(.../SosSoilLayer1D.cs)	(revision 672)
@@ -120,9 +120,9 @@
         public virtual void Assign(SosSoilLayer1D layer)
         {
             base.Assign(layer);
-            RemarkTopLevel = null;
-            MinimumTopLevel = null;
-            MaximumTopLevel = null;
+            RemarkTopLevel = this.remarkTopLevel;
+            MinimumTopLevel = this.minimumTopLevel;
+            MaximumTopLevel = this.maximumTopLevel;
         }
     }
 }
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