Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SoilProfiles/PipingSoilLayerTransformerTest.cs
===================================================================
diff -u -rc71efcd328d420bd869028dd35d035ff02d98ec2 -r8615eb0897ed3de888e2d5cb29659fa1d46d8df4
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SoilProfiles/PipingSoilLayerTransformerTest.cs	(.../PipingSoilLayerTransformerTest.cs)	(revision c71efcd328d420bd869028dd35d035ff02d98ec2)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SoilProfiles/PipingSoilLayerTransformerTest.cs	(.../PipingSoilLayerTransformerTest.cs)	(revision 8615eb0897ed3de888e2d5cb29659fa1d46d8df4)
@@ -98,6 +98,7 @@
             string expectedMessage = CreateExpectedErrorMessage(layer.MaterialName,
                                                                 "Ongeldige waarde voor parameter 'Is aquifer'.");
             Assert.AreEqual(expectedMessage, exception.Message);
+            Assert.IsInstanceOf<NotSupportedException>(exception.InnerException);
         }
 
         [Test]
@@ -397,7 +398,7 @@
             string expectedMessage = CreateExpectedErrorMessage(layer.MaterialName,
                                                                 "Ongeldige waarde voor parameter 'Is aquifer'.");
             Assert.AreEqual(expectedMessage, exception.Message);
-
+            Assert.IsInstanceOf<NotSupportedException>(exception.InnerException);
             Assert.IsNull(pipingSoilLayers);
         }