Forms 4.5 field property

     Is there anyone could tell me how to set a one character field in
     Forms 4.5 to overwriteable (replace mode)? Thank you in advance.
     My Platform is: Windows 3.11, Oracle 7.1.4.1.0, Forms 4.5.5.3.5

     Xinping Chu
     xchu_at_fed.ism.ca