Control-Level entry is not valid; defaults to previous control level.
20
Cause . . . . . : The Control-Level entry (positions 7 - 8) is not L0-L9, LR, SR, AN, OR, or blanks. SR can only be specified within a subroutine.
Recovery . . . : Correct the Control-Level entry (positions 7 - 8). Compile again.
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