Control-Levels entry is not L1-L9 or blanks; defaults to blanks.
20
Cause . . . . . : A Control-Levels entry (positions 63 - 64 of an Input-Field specification) is not L1-L9 or blanks.
Recovery . . . : Specify L1-L9 or blanks in the Control-Levels entry (positions 63 - 64). Compile again.
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