Answer Posted / kumarmf2004

Step1. Make sure that the input is sorted on the field
you are validating as duplicates (IN-FIELD in this
case)
Step2. In your program
IF IN-FIELD = HOLD-FIELD
CONTINUE
ELSE
WRITE OUTREC
MOVE IN-FIELD TO HOLD-FIELD
END-IF
READ IN-FILE

Keep performing Step 2 until end of file

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