Hi:

More by accident than knowledge, I created an unmodifiable field, I inverted a lookup to populate a field, and forgot to delete the corresponding lookup on the other field .  Functionally this "accident" is great for me, it prevents unintended changes, but I wonder if it may create other (not good) consequences.

I made a simplified file which recreates the "accident", you will see that the fields on the panel cannot be modified (they can be deleted by clicking on the red button).

Any comments are welcome, file is attached below.

Non_Modifiable_invoice (1).fmp12

Any thoughts / ideas about this? Comments will be very welcome! 😃😃

What kind of thoughts/ideas are you looking for? 

If you want to prevent modification of fields, I believe there are more straightforward ways to accomplish this - depending on the purpose of the restriction.