Position 20 (File Addition)

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Free-Form Syntax Specify *OUTPUT for the USAGE keyword
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Position 20 indicates whether records are to be added to an input or update file. For output files, this entry is ignored. This entry must be blank if the LIKEFILE keyword is specified.
Entry
Explanation
Blank
No records can be added to an input or update file (see the USAGE keyword for a free-form file definition or position 17 for a fixed-form file definition)).
A
Records are added to an input or update file when positions 18 through 20 of the output record specifications for the file contain "ADD", or when the WRITE operation code is used in the calculation specification.

See Positions 18-20 (Record Addition/Deletion) for the relationship between position 17 and position 20 of the file description specifications and positions 18 through 20 of the output specifications.