Sequence entry is not alphabetic for Look-Ahead record; defaults to AA.
20
Cause . . . . . : A Sequence entry (positions 17 - 18) of an Input-Record specification is not alphabetic when a Look-Ahead entry is specified in the Record-Identifying-Indicator field (positions 21 - 22).
Recovery . . . : Specify alphabetic characters (A-Z) for the Sequence entry (positions 17 - 18) when a Look-Ahead entry is specified in the Record-Identifying-Indicator field (positions 21 - 22). Compile again.
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