What screen and field are you referring to specifically? You should be able to enter any letter and a fair amount of symbols to the job name field in the 3-5 screen, but I'm not sure if that's what you meant or not.

If you mean to say the job number field, that's a key numeric field in the database, so it will most certainly be more particular than the name field.

Correct, I was referring to the job number field.