RFC Vs BAPI
BAPI are RFC enabled function modules. the difference between RFc and BAPI
are business objects. You create business objects and those are then registered
in your BOR (Business Object Repository) which can be accessed outside the SAP
system by using some other applications (Non-SAP) such as VB or JAVA.
In this case you only specify the business object and its method from
external system in BAPI there is no direct system call. while RFC are direct
system call Some BAPIs provide basic functions and can be used for most SAP business
object types. These BAPIs should be implemented the same for all business
object types. Standardized BAPIs are easier to use and prevent users having to
deal with a number of different BAPIs. Whenever possible, a standardized BAPI
must be used in preference to an individual BAPI. It is not
possible to connect SAP to Non-SAP systems to retrieve data using RFC alone.
RFC can acces the SAP from outside only through BAPI and same is for vice versa
access.
RFC is the protocol used by SAP for remote communication, that is, for
communications between remote (independent) systems. RFC is used for
communications between two independent SAP systems, or for communications
between an SAP system and a non-SAP system, such as an external application. It
can also be used for communications between modules on the same system. Using
the RFC interfaces you can extend the functionality of R/3 applications from an
external program.
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