The second RFC retrieves a list of individual data elements associated with a specific structure or table. Obviously, you don't need to invoke this RFC for import/export parameters as these are single fields and not structures. You would need to call "RFC_GET_STRUCTURE_DEFINITION" for each individual structure name returned from the previous RFC call.
I have already provided the code for this application as part of a SearchSAP.com IT checklist. Do a search for "jco cookbook" on SearchSAP.com for the complete source code.
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