Hi,
A BAPI is a business object. An RFC is functional code. IDOCs OR intermediate documents are standard data structures for electronic data interchange (EDI) between application programs. IDocs are used for asynchronous transactions: each IDoc generated exists as a self-contained text file that can then be transmitted to the requesting workstation without connecting to the central database.
BAPI is ultimately a mechanism for getting data out of SAP R/3. If a BAPI is a ship pushing a barge (data), the engine of that ship is a Remote Function Call (RFC). An RFC is a function module in a system that is called from some other system. This, of course, covers a great deal of ground. The two systems can both be SAP, or they can be different platforms, or an RFC may be used on the spot in real time by any party making an inquiry of an SAP system from the outside (including you, sitting at your laptop).
regards
sadhu kishore
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