Prefixed version of the external field name has already been used in this record.
30
Cause . . . . . : The prefixed version of the external field name (positions 21 - 30 on the Input specification) has already been used as an internal RPG name (positions 49 - 62 on the Input specification) in this record.
Recovery . . . : Omit this specification. Compile again.
Technical description . . . . . . . . : The prefixed version of an external field name is the external field name prefixed with the string specified for the PREFIX keyword on the File-Description specification.
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