Index: src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs
===================================================================
diff -u -r607 -r611
--- src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 607)
+++ src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 611)
@@ -1104,6 +1104,17 @@
             }
 
             var result = true;
+
+            // soil in borings
+            foreach (var b in Project.Borings)
+            {
+                if (b.BoringLayers.Any(x => x.Soil == soil))
+                {
+                    LogErrorCannotDelete(soil, b);
+                    result = false; 
+                }
+            }
+
             // 1D profiles
             foreach (var sp1d in Project.SoilProfiles1D)
             {