RE: How to validate input subfile

>> For validation part 
>> With READC you can get the subfile changed records
>> If you find any invalid values then flag on the Error indicators if any
>> Or display any error messages via message subfile 
>> Update your subfile record format and EXFMT your subfile control record
>> format

If you're using the READC operation to get changed records only, then on the
subfile record in the DDS you should code the SFLNXTCHG keyword conditioned
by an indicator.  For example:

     A          R SFL02                     SFL       
     A*         =======                               
     A  74                                  SFLNXTCHG 
     A            S£OPT          1A  B  8  3          
     A  31                                  COLOR(RED)
     A  31                                  DSPATR(PC)
     A            S£CURC         3A  B  8  7CHGINPDFT 
     A  50                                  DSPATR(PR)
     A N50                                  DSPATR(UL)
     A  32N50                               COLOR(RED)
     A  32                                  DSPATR(PC)
     A            S£DESC        40A  B  8 13          
     A  33                                  DSPATR(PC)
     A  33                                  COLOR(RED)
     A                                      CHECK(LC)

Then during your validation routine, immediately before updating the subfile
record with any error indicators you should turn on the SFLNXTCHG
conditioning indicator.  You do this regardless of whether there are any
errors or not so that if there are any errors then the record will be
re-read next time the user presses Enter, and if there aren't any errors
then READC can be used for processing the subfile after all errors have been
validated.

Best regards

Jonathan