What are the parameters of Function Module

Question

Hi,
What are the parameters of Function Module?

Answer 1

Function Modules are special external subroutine stored in a central library. The R/3 system provides numerous predefined function modules that you can call from the ABAP/4 programs.
All the function Modules are created under the Function Groups. Function Groups are nothing but the related group of function modules.
The function modules can be maintained through T.CodeSE37 and T.Code SE80.
In general the function module has the following components.
Documentation:
This is the place where you can find the discription/purpose of the function module.
Import & Export Parameters.
Import parameters correspond to the formal input parameters of subroutines. They pass data from the calling program to the function module.
Export parameters correspond to the formal input parameters of subroutines. They pass data from the function module back to the calling program.
Table Parameters.
Table parameters are internal tables. Internal tables are treated like changing parameters and are always passed by reference.
Exceptions.
Exceptions are used to handle error scenarios which can occur in the function modules. The function modules checks for any type of error and raise exception and returns SY-SUBRC value to the calling program.
Source Code:
the programming logic of the function module is written in this source code.
Rewards if useful.