Index: src/Deltares.DSoilModel.Forms/DSoilModelContext.cs
===================================================================
diff -u -r716 -r721
--- src/Deltares.DSoilModel.Forms/DSoilModelContext.cs	(.../DSoilModelContext.cs)	(revision 716)
+++ src/Deltares.DSoilModel.Forms/DSoilModelContext.cs	(.../DSoilModelContext.cs)	(revision 721)
@@ -425,6 +425,12 @@
                 }
             }
 
+            var cp = source as CharacteristicPoint;
+            if (cp != null && (member == cp.GetMemberName(p => p.X) || member == cp.GetMemberName(p => p.Z) || member == cp.GetMemberName(p => p.CharacteristicPointType)))
+            {
+                return false;
+            }
+
             return base.IsEnabled(source, member);
         }
 
Index: src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs
===================================================================
diff -u -r716 -r721
--- src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs	(.../DSoilModelContextTest.cs)	(revision 716)
+++ src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs	(.../DSoilModelContextTest.cs)	(revision 721)
@@ -476,8 +476,9 @@
             Assert.AreEqual(expectedEnabled, context.IsEnabled(grid, memberName));
         }
 
-        [TestCase(typeof(CharacteristicPoint), "X", null)]
-        [TestCase(typeof(CharacteristicPoint), "Z", null)]
+        [TestCase(typeof(CharacteristicPoint), "CharacteristicPointType", false)]
+        [TestCase(typeof(CharacteristicPoint), "X", false)]
+        [TestCase(typeof(CharacteristicPoint), "Z", false)]
         public void IsEnabledTest(Type senderType, string memberName, bool? expectedEnabled)
         {
             var sender = Activator.CreateInstance(senderType);