Field-Indicator entry is not valid; defaults to blanks.
20
Cause . . . . . : A Field-Indicator entry (positions 69 - 70, 71 - 72, or 73 - 74 of an Input specification) is not 01-99, H1-H9, U1-U8, RT, or blank.
Recovery . . . : Specify a valid Field-Indicator entry (positions 69 - 70, 71 - 72, or 73 - 74). Compile again.
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