Sequence entry must not be numeric for a full procedural file; defaults to AA.
20
Cause . . . . . : A Sequence entry (positions 17 - 18 of an Input-Record specification) is numeric, but the File-Designation entry in position 18 of the corresponding File-Description specification is F (full procedural).
Recovery . . . : Change the Sequence entry (positions 17 - 18) to alphabetic characters, or change the File-Designation entry (position 18) to P (primary) or S (secondary). Compile again.
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