IDoc (for intermediate document) is a standard data structure for electronic data interchange (EDI)
RFC: Remote function call is a call to a function module running in a system different from the caller's.
BAPIs (Business Application Programming Interfaces) is a OOPS Approach to RFC's Enablement. Bapis are Exposed to the outside world using JCO's etc
Bapi from SD : BAPI_SALESORDER_CreateFROMDATA2
IDoc uses RFC . BAPI uses sRFC
Allthough both IDOCS and BAPI can do the same job, Choice to use BAPI or IDOc depends on individual requirement. For Performance prespective we sometimes tend to prefer BAPI
Bluesky
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