Index: src/Deltares.DSoilModel.Data.Tests/SosSoilLayer1DTest.cs
===================================================================
diff -u -r631 -r680
--- src/Deltares.DSoilModel.Data.Tests/SosSoilLayer1DTest.cs	(.../SosSoilLayer1DTest.cs)	(revision 631)
+++ src/Deltares.DSoilModel.Data.Tests/SosSoilLayer1DTest.cs	(.../SosSoilLayer1DTest.cs)	(revision 680)
@@ -302,10 +302,10 @@
             };
 
             sosLayer2.Assign(sosLayer1);
-            // AS-IS: by some unclear and undocumented reason these properties should be NULL
-            Assert.IsNull(sosLayer2.RemarkTopLevel);
-            Assert.IsNull(sosLayer2.MinimumTopLevel);
-            Assert.IsNull(sosLayer2.MaximumTopLevel);
+
+            Assert.AreEqual("remark testSos2", sosLayer2.RemarkTopLevel);
+            Assert.AreEqual(23, sosLayer2.MinimumTopLevel);
+            Assert.AreEqual(22, sosLayer2.MaximumTopLevel);
         }
     }
 }
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