You can specify that the fields in logical files are to be input-only,
both (input/output), or neither fields.
Do this by specifying one of the following items in position 38:
- Entry
- Meaning
- Blank
- For simple or multiple format logical files, defaults to B (both) For
join logical files, defaults to I (input only).
- B
- Both input and output allowed; not valid for join logical files.
- I
- Input only (read only).
- N
- Neither input nor output; valid only for join logical files.
Note: The usage value (in position 38) is not used on a reference
function. When another file refers to a field (using a REF or REFFLD keyword)
in a logical file, the usage value is not copied into that file.