Locate the INVALID data in a field using FILE AID
The Easiest and Coolest way to locate bad data is thru File-Aid’sF IND command.
1.OPEN the file in FILE-AID (in either browse or edit mode)
2.XREF with COPYBOOK.
3.Use FMT mode
4.Then issue , F /field-name INVALID
F /field-number INVALID
The control will take you to the first invalid data record for the given field.
e.g., The FILE has 3 fields namely NAME,AGE,COUNTRY.
If you want to find the invalid data in the age field, then issue F /2 INVALID ( AGE is the second field in the copybook)