Index: src/Deltares.DSoilModel.Data/DSoilModelProject.cs
===================================================================
diff -u -r799 -r857
--- src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 799)
+++ src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 857)
@@ -961,6 +961,17 @@
                 }
             }
 
+            foreach (var boring in borings)
+            {
+                foreach (var layer in boring.BoringLayers)
+                {
+                    if (layer.Soil != null && !soils.Soils.Contains(layer.Soil))
+                    {
+                        soils.Add(layer.Soil);
+                    }
+                }
+            }
+
             foreach (var soil in soils.Soils)
             {
                 if (soil != null)