An Indicator-Negation entry is specified but there is no corresponding Indicator; defaults to blank.
20
Cause . . . . . : An Indicator-Negation entry is specified (position 21, 24, or 27), but no indicator is specified in the corresponding Output-Indicator entry (positions 21 - 23, 24 - 26, or 27 - 29). The Indicator-Negation entry defaults to blank.
Recovery . . . : Remove the Indicator-Negation entry, or specify a valid indicator in the corresponding Output-Indicator entry. Compile again.
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