Index: src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs
===================================================================
diff -u -r626 -r627
--- src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 626)
+++ src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 627)
@@ -1111,6 +1111,17 @@
             }
 
             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)
             {