Not entry must be blank when Position entry is blank; defaults to blank.
20
Cause . . . . . : The Not entry (position 28, 36, or 44 of an Input-Record specification) must be blank when the corresponding Position entry (positions 23 - 27, 31 - 35, or 39 - 43) is blank.
Recovery . . . : Correct the Not entry (position 28, 36, or 44) or the Position entry (positions 23 - 27, 31 - 35 or 39 - 43). Compile again.
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