But I don't want my ‘next field’ key to suddently stop moving between fields and instead enter characters, just because some fields of text are different from o

But I don't want my ‘next field’ key to suddently stop moving between fields and instead enter characters, just because some fields of text are different from other fields of text. The mess goes back to IBM pre-computer unit record (punch card) equipment, for which fields were just columns on a card and moving to the next tab stop was the same as moving to the next field if you set up your keypunch appropriately.