I have to use the MUST FILL option for a particular field in a MAP. In one of the books it's given that if the user is not entering the full length of the field, it will trigger an error when the user leaves the field. I don't know how to implement this though.
In this case you do not have to do anything. Setting this attribute on a field means that the terminal will raise an error (one of those lightening flashes on the bottom line of the screen) if it is not completely filled up when the cursor moves away from the field. And, you cannot press Enter to start the CICS transaction if such an error is around. But, I'd always check in the program that the field has been completely filled in as well.
You need to look at the 3270 LU2 documentation for a full description of this protocol. I always used to call it the "Green Book" in those far off days.
CICS Technical Strategist -- CICS expert at Search390.com
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