Comment 5 for bug 1073106

One more thing: please let me correct myself: the field should be read-only as soon as the record is created.
As I noted on another bug, I doubt we can find a generic way to know if the serial number's product is safe to change or not : there may be custom addons that depend on it, in addition to the standard Stock Moves.
I hope this is clear enough, just tell me if it isn't.
Lionel