How to create Function Module

Hi,
I am trying to create a function module using RSAX_BIW_GET_DATA_SIMPLE as a template. Can someone tell me how can I modify and rename this module. Also, how can I create extract structure from the function module.
I have tried to create a module in the module group by right cliking and then 'create', but it wouldn't let me do that way instead it giving me message 'function module name is reserved for SAP'. I get this message no matter what name I provide.
Basically I am trying to create a function module to extract data from SD module into BW. I appreciate your help with reward.
Thanks,
Rao.

Hi,
It is almost the same but a different transaction.
1. Goto SE37.
2. Follow the path
Goto --> Function Group --> Create Group
3. Then enter a function name Z***** and click create.
The following link gives you more information about the functions and groups and others:
http://cma.zdnet.com/book/abap/ch19/ch19.htm
If you are looking for ENHANCEMENT kind of a thing then follow the following path:
1. Log onto R/3
2. TCODE: SMOD
3. Enhancement RSAP0001.
4. Double click on the one you are looking for i.e. Transaction / Master Data.
5. In the Function Module Double click on the INCLUDE.
Hope it helps,
Regards,
GPK.
Message was edited by: Praveen

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Hi,
You can only create function modules and function groups using the Function Builder in the ABAP Workbench. For further information, refer to Creating New Function Modules. This section uses an example to illustrate how a function module is created from the point of view of ABAP programming.
Function Groups and Function Modules:
Firstly, we create a new function group DEMO_SPFLI to hold the function module. Then, we can create the new function module.
Parameter Interface:
You can specify the types of interface parameters in function modules in the
same way as the parameter interfaces of subroutines. Since function
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references to data types that are declared systemwide. These are the elementary
ABAP data types, the systemwide generic types, such as ANY TABLE, and types
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Our function module needs an exception that it can trigger if there are no entries
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Source Code:
Having defined the parameter interface and exceptions, we can now write the
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defined in the include program L<fgrp>TOP. To open this include, choose Goto
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loaded into memory. It can then be accessed and changed by all of the function
modules in the group. The system retains the values until the next time a function
module is called.
Calling Subroutines
You use subroutines for local modularization. Function modules can
also use this technique. The function module that they call are defined in the
corresponding main program.
If you only want to call a subroutine from a single function module, it is best to
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after the ENDFUNCTION statement. These subroutines can be called from all
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RAISE <except>.
and
MESSAGE..... RAISING <except>.
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If the calling program does not handle the exception
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The MESSAGE ..... RAISING statement display the specified message. How the
processing continues depends on the message type.
If the calling program handles the exception, both statements return control to the
program. No values are transferred. The MESSAGE ..... RAISING statement
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The entire source code of READ_SPFLI_INTO_TABLE looks like this:
FUNCTION READ_SPFLI_INTO_TABLE.
""Local interface:
*" IMPORTING
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*" EXPORTING
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i want elaborately.
regards,
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hi,
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Message was edited by:
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Message was edited by:
        Lisa Roy

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hi Saifur Rahaman,
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