Answer Posted / sambasivarao

Basically,the word function module come from reusability
technique. Depending on this reusability and scope we can
categorize the types of function modules.

4 types of function modules:

1. Subroutines - scope is within program or package
(using external calling mechanism).
2.Normal function module- scope is within R3 system.

3.Remote enable function module(RFC)- scope is between R3
systems
4. BAPI - scope is between sap and non-sap legacy systems
and can be used within R3 systems also.

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