Look-Ahead is not allowed for externally-described file.
20
Cause . . . . . : An Input-Record specification for an externally-described file has a Record-Identifying-Indicator entry (positions 21 - 22) which contains **. The Record-Identifying-Indicator defaults to blanks.
Recovery . . . : Specify blanks, 01-99, L1-L9, LR, H1-H9, U1-U8, or RT in the Record-Identifying-Indicator entry (positions 21 - 22) for an externally-described file. Compile again.
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