Values cannot be changed for created by

I keep receiving this problem whenever I save and add a new doc field to a doctype or make any other changes to it. I made this doctype using a custom module.

did you find a solution for this ?,
i am facing the same.
i see there is an validation for validate_set_only_once - which might be a new thing in v14

Is there any solution?

no , this happens when you upgrade your version or get the app from old version ,

you basically have to recreate the whole doctype as new if its custom ,
just duplicate it and maybe add a space to the name

I have written small code workaround here:

I hope it helps.
Jiri Sir