The File-Designation entry is not valid; defaults to blank.
20
Cause . . . . . : The File-Designation entry (position 18) of a File Specification is not P, S, R, T, F or blank. The File-Designation entry defaults to blank.
Recovery . . . : Specify P, S, R, T, F, or blank (position 18) for the File-Designation option. Compile again.
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