Display File DDS question

["James H H Lampert" <jamesl@xxxxxxxxxxx>]

I'm currently looking through the DDS manual, trying to 
work out a way for a 2-character alphanumeric field to 
accept "A", "C", "X", or a digit from 1 to 9 (in either 
column, with the other column blank), or any 2-digit 
number from "01" to "99", and reject any other entry. 
Preferably doing all the validation within the display 
file.

I noticed that the "VALUES" keyword can only accommodate 
100 values, and that wouldn't be enough to cover every 
valid value individually.

Can anybody suggest something I may be overlooking? Or 
tell me outright that it's impossible, and that I need to 
do the validation in the program?

--
JHHL