The field used as a field index on the Field-Name entry (positions 32-37) is not valid to be used as an array index, or the Field-Name entry is a named constant entry, or the field index contains embedded blanks, or the field index begins with a numeric character. The specification is ignored.
Specify a valid numeric field as the field index on the Field-Name entry, or remove the field index from the Field-Name entry if it is a named constant.
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