The Sequence entry is not blank, A, or D; defaults to blank.
20
Cause . . . . . : The Sequence entry (position 21) of a File Description specification is not blank (no sequence specified), A (ascending sequence), or D (descending sequence). Defaults to blank.
Recovery . . . : Specify a blank, A, or D (position 21) for the Sequence entry. Compile again.
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