Index: DamClients/DamUI/trunk/src/Dam/Forms/DamContext.cs
===================================================================
diff -u -r2946 -r2959
--- DamClients/DamUI/trunk/src/Dam/Forms/DamContext.cs	(.../DamContext.cs)	(revision 2946)
+++ DamClients/DamUI/trunk/src/Dam/Forms/DamContext.cs	(.../DamContext.cs)	(revision 2959)
@@ -203,10 +203,11 @@
                 return true;                
             }
 
-            if (source is Soil && member != StaticReflection.GetMemberName<Soil>(x => x.StrengthIncreaseExponent))
+            if (source is SoilList)
             {
-                return false;
+                return true;
             }
+
             var specification = source as DamProjectCalculationSpecification;
             if (specification != null)
             {