Index: src/Plugins/Wti/Wti.Data/PipingData.cs
===================================================================
diff -u -rf65154bc499025f9f5b37b9de0ebdf8026336020 -r9260afadbd7ccee6409417730493babf258cc103
--- src/Plugins/Wti/Wti.Data/PipingData.cs	(.../PipingData.cs)	(revision f65154bc499025f9f5b37b9de0ebdf8026336020)
+++ src/Plugins/Wti/Wti.Data/PipingData.cs	(.../PipingData.cs)	(revision 9260afadbd7ccee6409417730493babf258cc103)
@@ -156,7 +156,7 @@
         /// <summary>
         /// Gets or sets the surface line.
         /// </summary>
-        public PipingSurfaceLine SurfaceLine { get; set; }
+        public RingtoetsPipingSurfaceLine SurfaceLine { get; set; }
 
         /// <summary>
         /// Gets or sets <see cref="PipingOutput"/>, which contains the results of a Piping calculation.