Answer / shame.er

Function Module : In a function module passing data is by
call by reference in particular the tables parameter has to
by call by reference by passing memory.
RFC: In a RFC passing data is by value the reason is its
going to access other system while doing the above by
reference wouldn't work as we r into another system whose
memory id will not match,this is the basic cause for
creation of RFC.
Hope this answers the above answer is not right plz ignore.LOLZ

Answer / gvkreddy

RFC: The FM are globally Existed.
Normal FM: these are existed locally.
Both return values.

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