Wish about locking values coming from an expression

[Mats_Knutsson]

Hi,
I create a property named "ID" using an expression getting the Element ID and I put this "ID" as a schedule field.
I also add Element ID directly in the schedule so I have two rows shoing the same Element ID...one from expression and one "direct".

If I change the direct ID in the schedule the expression ID changes since it's reading the Element ID.

If I change the expression ID the direct ID doesn't change. I can go to the door settings an revert the expression ID to the default value.

This is so dangerous... I'd like a possibility to lock values coming from an expression from being editable like this in the schedule. Expressions are really good but this drives me nuts. To many ifs and butts and work arounds kill creativity. Maybe there is a way to make the property uneditable but in that case I don't know how.

(well....not only expressions...)

Br,

Mats