The Sequence entry is not valid for the specified designation; defaults to blank.
20
Cause . . . . . : The Sequence entry (position 21) is only valid for cycle files. The File-Designation entry (position 18) is not P (primary cycle file) or S (secondary cycle file). The Sequence entry defaults to blank.
Recovery . . . : Specify a blank (position 21) for the Sequence entry, or change the Designation entry (position 18) to P or S. Compile again.
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