An external name can only be used once for imported or exported fields.
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Cause . . . . . : The external name of an imported or exported field cannot be repeated for another imported or exported field. The external name of an imported or exported field is the name specified as the parameter of the IMPORT or EXPORT keyword; or if no parameter was specified, it is the upper-cased internal RPG name. Only the first IMPORT or EXPORT keyword for this external name is used. The EXPORT or IMPORT keyword is ignored.
Recovery . . . : Correct the external names of imported and exported fields so that each external name is only used once. Compile again.
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