Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs
===================================================================
diff -u -r0eef796eb9da995e56fd1e4a61296ec3c25dcfad -r5762f5a734abc237f01cd62257cedd7ba2e9c8e8
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision 0eef796eb9da995e56fd1e4a61296ec3c25dcfad)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision 5762f5a734abc237f01cd62257cedd7ba2e9c8e8)
@@ -124,18 +124,22 @@
         [DynamicReadOnlyValidationMethod]
         public bool DynamicReadOnlyValidationMethod(string propertyName)
         {
-            if (propertyName == TypeUtils.GetMemberName<PipingInputContextProperties>(p => p.AssessmentLevel))
+            if (propertyName == nameof(AssessmentLevel))
             {
                 return !data.WrappedData.UseAssessmentLevelManualInput;
             }
+            if (propertyName == nameof(EntryPointL) || propertyName == nameof(ExitPointL))
+            {
+                return data.WrappedData.SurfaceLine == null;
+            }
 
             return true;
         }
 
         [DynamicVisibleValidationMethod]
         public bool DynamicVisibleValidationMethod(string propertyName)
         {
-            if (propertyName == TypeUtils.GetMemberName<PipingInputContextProperties>(p => p.SelectedHydraulicBoundaryLocation))
+            if (propertyName == nameof(SelectedHydraulicBoundaryLocation))
             {
                 return !data.WrappedData.UseAssessmentLevelManualInput;
             }
@@ -325,6 +329,7 @@
             }
         }
 
+        [DynamicReadOnly]
         [PropertyOrder(entryPointLPropertyIndex)]
         [ResourcesCategory(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.Categories_Schematization))]
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.PipingInput_EntryPointL_DisplayName))]
@@ -341,6 +346,7 @@
             }
         }
 
+        [DynamicReadOnly]
         [PropertyOrder(exitPointLPropertyIndex)]
         [ResourcesCategory(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.Categories_Schematization))]
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.PipingInput_ExitPointL_DisplayName))]