Diff between Function Module and subroutine

sir,
explain the difference between Function Module and Subroutine.

Hi Sandeep,
Subroutines:
Subroutines are procedures that you can define in any ABAP program and also call from any program. Subroutines are normally called internally, that is, they contain sections of code or algorithms that are used frequently locally. If you want a function to be reusable throughout the system, use a function module.
Function Modules:
Function modules are procedures that are defined in function groups (special ABAP programs with type F) and can be called from any ABAP program. Function groups act as containers for function modules that logically belong together. You create function groups and function modules in the ABAP Workbench using the Function Builder.
Function modules allow you to encapsulate and reuse global functions in the R/3 System. They are stored in a central library.
Unlike subroutines, you do not define function modules in the source code of your program. Instead, you use the Function Builder.
Regards,
Sunil

Similar Messages

Difference between function module and subroutines

hey all...
can u pls explai me the exact difference between subroutines and function modules...
also, when is a sub routine used and also when is a function module used..???
regards..
vishal

Hi Vishal,
Basically they do the same thing and purpose is almost same but tecnically the are way apart:
Function modules must belong to a pool called a function group.
They possess a fixed interface for data exchange. This makes it easier for you to pass input and output parameters to and from the function module.
For example, you can assign default values to the input parameters. The interface also supports exception handling. This allows you to catch errors and pass them back to the calling program for handling.
They use their own memory area. The calling program and the function module cannot exchange data using a shared memory area - they must use the function module interface. This avoids unpleasant side effects such as accidentally overwriting data.
You call a function module by its name (which must be unique) in a CALL FUNCTION statement.
and also
Unlike subroutines, you do not define function modules in the source code of your program. Instead, you use the Structure link Function Builder.
Check this link too
Re: Regarding difference between Subroutines and Function modules
Hope this helps you,
Regards
Amit
Message was edited by: Amit Kumar

Custome BAPI - declare ITAB and define the Function Module and Subroutine

Hello Experts
I want to create a Custom BAPI and it has the following scenario:
1) a Function Module which collects some records into it internal table, say ITAB
2) a Subroutine which moved the records from ITAB to BAPI table
Now, I want to declare ITAB and define the Function Module and Subroutine.
Where and How can I do this?
Plz suggest.
Regards
BD

Hi,
1) Got to SE37 and create an RFC .
2) Declare the ITAB directly in the TABLES tab of the FM.
3) Inside the FM source Code tab, collect all the data using SELECT query and directly or by using logic, put the data into the
      ITAB.
4) Since the data collected is directly put into the itab you dont need a subroutine to be written.
5) If subroutine is a necessity, then just write PERFORM SUB ROUTINE NAME.
       AND DEFINE THE FORM ENDFORM OF THE SUBROUTINE AFTER THE ENDFUNCTION OF THE FM
   Let me know if any issues....
Regards,
Vimal.

Difference between Function module and a subroutine

hi
In the case of subroutine i can access the global workarea values.
I want to know whether in the case of function module
whether
i can follow the same procedure to access the workarea values
or
i have to pass this workarea values as an import or tables parameter to the function module and then use it
(in first case whether that workarea to make global whether i have to place it in function pool please check this but which is better one)
Thx in advance for any replies.

Yes
You would have to pass the values as import parameters to access the global variables of the program otherwise you will not be able to get the values of the global variable from inside the program.
Another solution would be to export to SAP memory but the entire concept of modularization of using the FM would be lost.

Difference between function module and a method?

Hi Experts
Can anybody pls tell me the technical and functional difference between function moduel and a method?
Thanks
Sudhansu

Hi,
Function modules are procedures that are defined in function groups (special ABAP programs with type F) and can be called from any ABAP program. Function groups act as containers for function modules that logically belong together. You create function groups and function modules in the ABAP Workbench using the Function Builder.
Function modules allow you to encapsulate and reuse global functions in the R/3 System. They are stored in a central library. The R/3 System contains a wide range of predefined function modules that you can call from any ABAP program. Function modules also play an important role in database updates and in remote communications between R/3 Systems or between an R/3 System and a non-SAP system.
You can declare methods in the declaration part of a class or in an interface. To declare instance methods, use the following statement:
METHODS <meth> IMPORTING.. [VALUE(]<ii>[)] TYPE type [OPTIONAL]..
 EXPORTING.. [VALUE(]<ei>[)] TYPE type [OPTIONAL]..
 CHANGING.. [VALUE(]<ci>[)] TYPE type [OPTIONAL]..
 RETURNING VALUE(<r>)
 EXCEPTIONS.. <ei>..
When you declare a method, you also define its parameter interface using the additions IMPORTING, EXPORTING, CHANGING, and RETURNING. The additions define the input, output, and input/output parameters, and the return code. They also define the attributes of the interface parameters, namely whether a parameter is to be passed by reference or value (VALUE), its type (TYPE), and whether it is optional (OPTIONAL, DEFAULT).
Unlike in function modules, the default way of passing a parameter in a method is by reference.
As in function modules, you can use exception parameters (EXCEPTIONS) to allow the user to react to error situations when the method is executed.
As in function modules, you can use the RAISE <exception> and MESSAGE RAISING statements to handle error situations.
Regards,
Sruthi

Difference between function module and userexit and badi

Hello Gurus,
                As a functional consultant i want to know what is function module and user exit and badi.
what is the difference between function module , user exit and badi?
regds
Ramachandra

Rama,
Function modules are ABAP routines that are administered in a central function library. They apply across applications and are available throughout the system. You must assign function modules to a function pool that is called a function group. A function group is nothing but a container for the function modules.
Business Add-Ins are a new SAP enhancement technique based on ABAP Objects. They can be inserted into the SAP System to accommodate user requirements too specific to be included in the standard delivery. Since specific industries often require special functions, SAP allows you to predefine these points in your software.
User exit - A user exit is a three character code that instructs the system to access a program during system processing.
SXX: S is for standard exits that are delivered by SAP.   XX represents the 2-digit exit number.
UXX: U is for user exits that are defined by the user. XX represents the 2-digit exit number .
Difference between BADI and USER-EXIT.
    i) BADI's can be used any number of times, where as USER-EXITS can be used only one time.
       Ex:- if your assigning a USER-EXIT to a project in (CMOD), then you can not assign the same to other project.
    ii) BADI's are oops based.
Hope this helps you.
Rgds
Manish

Macros, Function modules and subroutines

Hi Experts,
In performance wise which one is best macro or subroutine or Function module?
Thanks.

Hi Nandini,
Each and every one has its importance in certain situations..
Macros
If you want to reuse the same set of statements more than once in a program, you can include them in a macro. For example, this can be useful for long calculations or complex WRITE statements. You can only use a macro within the program in which it is defined, and it can only be called in lines of the program following its definition.
Subroutines can call other subroutines (nested calls) and may also call themselves (recursive calls). Once a subroutine has finished running, the calling program carries on processing after the PERFORM statement. You can use the USING and CHANGING additions to supply values to the parameter interface of the subroutine.
Function modules allow you to encapsulate and reuse global functions in the SAP System. They are managed in a central function library. The SAP System contains several predefined functions modules that can be called from any ABAP program. Function modules also play an important role during updating and in interaction between different SAP systems, or between SAP systems and remote systems through remote communications.
Unlike subroutines, you do not define function modules in the source code of your program. Instead, you use the Function Builder. The actual ABAP interface definition remains hidden from the programmer. You can define the input parameters of a function module as optional. You can also assign default values to them. Function modules also support exception handling. This allows you to catch certain errors while the function module is running. You can test function modules without having to include them in a program using the Function Builder.
Best regards,
raam

Difference between Function Module and Routine

Hi,
I am zero at ABAP Skill.
Can any one explain me what is the difference between Routine in BW and Function Module .
Thanks

Hi,
well basically it is almost the same. Both have a defined interface. You can pass variables to them and they can return variables. They can also change parameters... The main difference is, that a routine (form routine) can be used within the program where it is defined only and a function module can be used in all programs, form routines.
regards
Siggi

Difference Between Function Module And BAPI

Hi Friends,
What is the technical difference between BAPI and Function Module (Normal, RFC and update)?
When do we use BAPI and FM?
If BAPI is also RFC enabled then why do we have RFC function module?
Kindly clarify with examples.
Regards,
Pradeep Singh Dhadwal

Hi Pradeep,
BAPI vs FM
Difference between FM and BAPI
BAPI stands for Business API(Application Program Interface).
A BAPI is remotely enabled function module
ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..
You can make your function module remotely enabled in attributes of Function module but
A BAPI are standard SAP function modules provided by SAP for remote access.
Also they are part of Businees Objest Repository(BOR).
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.
FM
Normal FM used internally inside SAP.
Hope this helps,
Manish

LINKING BETWEEN FUNCTION MODULE AND INTERACTIVE NO. OF BASIC LIST

Dear Mates,
Iam preparing Z report for BOM display of FG and SFG materials.
Iam displaying the Basic List using the MAST table. Here i double click on the material no.
Here iam using the function module :CS_BOM_EXPL_MAT_V2 for fetching the data from STPOX structure ,here i want to link material no. which has been from basic list and the above said function module.
Can anybody provide the solution for the above said linking in ALV interactive report.
Please treat it very urgent as this report is to be presented on high priority.
Thanks in advance
Subbu

Hi
use the Function module REUSE_ALV_POPUP_TO_SELECT.
check the below example:
REPORT ZSR_ALV_INTERACTIVE.
TABLES : LFA1,EKKO,EKPO.
SELECT-OPTIONS : VENDOR FOR LFA1-LIFNR.
DATA : BEGIN OF ITAB OCCURS 0,
LIFNR LIKE LFA1-LIFNR,
NAME1 LIKE LFA1-NAME1,
END OF ITAB.
DATA : BEGIN OF JTAB OCCURS 0,
EBELN LIKE EKKO-EBELN,
AEDAT LIKE EKKO-AEDAT,
END OF JTAB.
DATA : BEGIN OF KTAB OCCURS 0,
EBELP LIKE EKPO-EBELP,
MATNR LIKE EKPO-MATNR,
END OF KTAB.
TYPE-POOLS : SLIS.
DATA : REPID LIKE SY-REPID.
DATA :LFA1_B TYPE SLIS_T_FIELDCAT_ALV,
LFA1_W TYPE SLIS_FIELDCAT_ALV,
EKKO_B TYPE SLIS_T_FIELDCAT_ALV,
EKKO_W TYPE SLIS_FIELDCAT_ALV,
EKPO_B TYPE SLIS_T_FIELDCAT_ALV,
EKPO_W TYPE SLIS_FIELDCAT_ALV,
EVENTS_B TYPE SLIS_T_EVENT,
EVENTS_W TYPE SLIS_ALV_EVENT.
PERFORM GET_VAL.
REPID = SY-REPID.
SELECT LIFNR NAME1 FROM LFA1 INTO TABLE ITAB WHERE LIFNR IN VENDOR.
*perform val USING USER_COMMAND sel.
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = REPID
IT_FIELDCAT = LFA1_B
IT_EVENTS = EVENTS_B
TABLES
T_OUTTAB = ITAB.
*& Form GET_VAL
text this is to put column headings
FORM GET_VAL.
LFA1_W-FIELDNAME = 'LIFNR'.
LFA1_W-REF_TABNAME = 'LFA1'.
LFA1_W-REF_FIELDNAME = 'LIFNR'.
APPEND LFA1_W TO LFA1_B.
LFA1_W-FIELDNAME = 'NAME1'.
LFA1_W-REF_TABNAME = 'LFA1'.
LFA1_W-REF_FIELDNAME = 'NAME1'.
APPEND LFA1_W TO LFA1_B.
EKKO_W-FIELDNAME = 'EBELN'.
EKKO_W-REF_TABNAME = 'EKKO'.
EKKO_W-REF_FIELDNAME = 'EBELN'.
APPEND EKKO_W TO EKKO_B.
EKKO_W-FIELDNAME = 'AEDAT'.
EKKO_W-REF_TABNAME = 'EKKO'.
EKKO_W-REF_FIELDNAME = 'AEDAT'.
APPEND EKKO_W TO EKKO_B.
EKPO_W-FIELDNAME = 'EBELP'.
EKPO_W-REF_TABNAME = 'EKPO'.
EKPO_W-REF_FIELDNAME = 'EBELP'.
APPEND EKPO_W TO EKPO_B.
EKPO_W-FIELDNAME = 'MATNR'.
EKPO_W-REF_TABNAME = 'EKPO'.
EKPO_W-REF_FIELDNAME = 'MATNR'.
APPEND EKPO_W TO EKPO_B.
EVENTS_W-NAME = 'USER_COMMAND'.
EVENTS_W-FORM = 'VAL'.
APPEND EVENTS_W TO EVENTS_B.
ENDFORM. "GET_VAL
*& Form VAL
text
-->USER_COMMANtext
-->SEL text for retrieving data
FORM VAL USING USER_COMMAND LIKE SY-UCOMM SEL TYPE SLIS_SELFIELD.
DATA : VEN(10) TYPE N,
PO(10) TYPE N.
DATA : MAT(10) TYPE C.
IF SEL-FIELDNAME = 'LIFNR'.
VEN = SEL-VALUE.
SELECT EBELN AEDAT FROM EKKO INTO TABLE JTAB WHERE LIFNR = VEN.
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = REPID
I_STRUCTURE_NAME = EKKO_B
IT_FIELDCAT = EKKO_B
IT_EVENTS = EVENTS_B
TABLES
T_OUTTAB = JTAB.
ENDIF.
IF SEL-FIELDNAME = 'EBELN'.
PO = SEL-VALUE.
SELECT EBELP MATNR FROM EKPO INTO TABLE KTAB WHERE EBELN = PO.
CALL FUNCTION 'REUSE_ALV_POPUP_TO_SELECT'
EXPORTING
I_TITLE = 'ITEM DETAILS'
I_TABNAME = 'EKPO'
IT_FIELDCAT = EKPO_B
I_CALLBACK_PROGRAM = REPID
IMPORTING
ES_SELFIELD = SEL
TABLES
T_OUTTAB = KTAB.
ENDIF.
logic to select a record
IF SEL-FIELDNAME = 'MATNR'.
MAT = SEL-VALUE.
SET PARAMETER ID 'MAT' FIELD MAT.
CALL TRANSACTION 'MM02' AND SKIP FIRST SCREEN.
ENDIF.
ENDFORM. "VAL
check my example:
REPORT ZSR_ALV_INTERACTIVE.
TABLES : LFA1,EKKO,EKPO.
SELECT-OPTIONS : VENDOR FOR LFA1-LIFNR.
DATA : BEGIN OF ITAB OCCURS 0,
LIFNR LIKE LFA1-LIFNR,
NAME1 LIKE LFA1-NAME1,
END OF ITAB.
DATA : BEGIN OF JTAB OCCURS 0,
EBELN LIKE EKKO-EBELN,
AEDAT LIKE EKKO-AEDAT,
END OF JTAB.
DATA : BEGIN OF KTAB OCCURS 0,
EBELP LIKE EKPO-EBELP,
MATNR LIKE EKPO-MATNR,
END OF KTAB.
TYPE-POOLS : SLIS.
DATA : REPID LIKE SY-REPID.
DATA :LFA1_B TYPE SLIS_T_FIELDCAT_ALV,
LFA1_W TYPE SLIS_FIELDCAT_ALV,
EKKO_B TYPE SLIS_T_FIELDCAT_ALV,
EKKO_W TYPE SLIS_FIELDCAT_ALV,
EKPO_B TYPE SLIS_T_FIELDCAT_ALV,
EKPO_W TYPE SLIS_FIELDCAT_ALV,
EVENTS_B TYPE SLIS_T_EVENT,
EVENTS_W TYPE SLIS_ALV_EVENT.
PERFORM GET_VAL.
REPID = SY-REPID.
SELECT LIFNR NAME1 FROM LFA1 INTO TABLE ITAB WHERE LIFNR IN VENDOR.
*perform val USING USER_COMMAND sel.
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = REPID
IT_FIELDCAT = LFA1_B
IT_EVENTS = EVENTS_B
TABLES
T_OUTTAB = ITAB.
*& Form GET_VAL
text this is to put column headings
FORM GET_VAL.
LFA1_W-FIELDNAME = 'LIFNR'.
LFA1_W-REF_TABNAME = 'LFA1'.
LFA1_W-REF_FIELDNAME = 'LIFNR'.
APPEND LFA1_W TO LFA1_B.
LFA1_W-FIELDNAME = 'NAME1'.
LFA1_W-REF_TABNAME = 'LFA1'.
LFA1_W-REF_FIELDNAME = 'NAME1'.
APPEND LFA1_W TO LFA1_B.
EKKO_W-FIELDNAME = 'EBELN'.
EKKO_W-REF_TABNAME = 'EKKO'.
EKKO_W-REF_FIELDNAME = 'EBELN'.
APPEND EKKO_W TO EKKO_B.
EKKO_W-FIELDNAME = 'AEDAT'.
EKKO_W-REF_TABNAME = 'EKKO'.
EKKO_W-REF_FIELDNAME = 'AEDAT'.
APPEND EKKO_W TO EKKO_B.
EKPO_W-FIELDNAME = 'EBELP'.
EKPO_W-REF_TABNAME = 'EKPO'.
EKPO_W-REF_FIELDNAME = 'EBELP'.
APPEND EKPO_W TO EKPO_B.
EKPO_W-FIELDNAME = 'MATNR'.
EKPO_W-REF_TABNAME = 'EKPO'.
EKPO_W-REF_FIELDNAME = 'MATNR'.
APPEND EKPO_W TO EKPO_B.
EVENTS_W-NAME = 'USER_COMMAND'.
EVENTS_W-FORM = 'VAL'.
APPEND EVENTS_W TO EVENTS_B.
ENDFORM. "GET_VAL
*& Form VAL
text
-->USER_COMMANtext
-->SEL text for retrieving data
FORM VAL USING USER_COMMAND LIKE SY-UCOMM SEL TYPE SLIS_SELFIELD.
DATA : VEN(10) TYPE N,
PO(10) TYPE N.
DATA : MAT(10) TYPE C.
IF SEL-FIELDNAME = 'LIFNR'.
VEN = SEL-VALUE.
SELECT EBELN AEDAT FROM EKKO INTO TABLE JTAB WHERE LIFNR = VEN.
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = REPID
I_STRUCTURE_NAME = EKKO_B
IT_FIELDCAT = EKKO_B
IT_EVENTS = EVENTS_B
TABLES
T_OUTTAB = JTAB.
ENDIF.
IF SEL-FIELDNAME = 'EBELN'.
PO = SEL-VALUE.
SELECT EBELP MATNR FROM EKPO INTO TABLE KTAB WHERE EBELN = PO.
CALL FUNCTION 'REUSE_ALV_POPUP_TO_SELECT'
EXPORTING
I_TITLE = 'ITEM DETAILS'
I_TABNAME = 'EKPO'
IT_FIELDCAT = EKPO_B
I_CALLBACK_PROGRAM = REPID
IMPORTING
ES_SELFIELD = SEL
TABLES
T_OUTTAB = KTAB.
ENDIF.
logic to select a record
IF SEL-FIELDNAME = 'MATNR'.
MAT = SEL-VALUE.
SET PARAMETER ID 'MAT' FIELD MAT.
CALL TRANSACTION 'MM02' AND SKIP FIRST SCREEN.
ENDIF.
ENDFORM. "VAL

Function module vs Subroutine

hi,
One of the main difference between Function module and the subroutine is that Function module can return values but subroutine cannot.I could not understand this point.
can anybody tell me how i can see the difference between fm and subroutine with an example?
Thanks in advance.

Hi
As mentioned, both forms and FMs are reusable modularization units. To distinguish we generally say that forms are used for internal modularization and FMs are used for external modularization.
To decide on which to implement, consider whether you need the content to be used just for a limited program or wheteher it can be called from many independent programs. For the first purpose it is better to implement a form whereas for the second we implement an FM.
However, ABAP does not isolate the usage context. That is; you can call a form from another program within whose code the form is not actually implemented. However, this requires attention since the form may utilize global variables.
The same issue holds for FMs. FMs are encapsulated in function groups and function groups may have global variables that can be globally used by all FMs inside it.
Regards
*--Serdar <a href="https://www.sdn.sap.com:443http://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.sdn.businesscard.sdnbusinesscard?u=qbk%2bsag%2bjiw%3d">[ BC ]</a>

What is the difference between the normal function module and bapi function

hi,
what is the difference between the normal function module and bapi function module.

Hi
BAPI stands for Business API(Application Program Interface).
A BAPI is remotely enabled function module ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..
You can make your function module remotely enabled in attributes of Function module but
A BAPI are standard SAP function modules provided by SAP for remote access. Also they are part of Businees Objest Repository(BOR).
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 u 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.
Regards
Anji

To use SubRoutines and function modules and include

Hellow Friends ,
Can any body suggest me at waht situations we have to use SubRoutines and function modules and include in an abap report and also i need the standards in an abap program.

Hi Rajesh,
You use create subroutines within your programs for those block of codes which are used often within the scope of the development. Function modules are like global subroutines , hence any number programs which might want to use the functionality within the function module can do so.
Creating includes is a good programming prctise, e.g. one for data declerations , one for subroutines, so that it makes the code more reader friendly and also helps in modularizing the program. Also once you put a subroutine in an include, you can use the same subroutine in other programs by referring to the include with the INCLUDE statement in your other programs.
Hence basically they are used for :
1. Reusability
2. Modularization of code (make it more readable)
Hope this is of some help.
Regards,
Aditya

Difference between check function module and start condition

Hello Rob,
In previous answer u said thr is no difference between check function module and startcondition but there is a difference between checkfunction module and start condition.
Before the workflow is triggering can u able to check the conditions in startcondition.The startcondition can check the condition only after the workflow has been triggered.
But in check function module u can check the condtion before the workflow got triggered.

Kjetil,
Dont' fall for it, these two (unless deephak and catherina are the same person...) are just spamming the forum.
<a href="https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206751">https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206751</a>
<a href="https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206440">https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206440</a>
<a href="https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3207214">https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3207214</a>
<a href="https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3207179">https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3207179</a>
As you've correctly established, even the SAP documentation contradicts their nonsense. A start condition is implemented as a check function, so there is no difference; and NO workflow is started at any time if they fail.
Cheers,
Mike

Difference between BAPI Function Module and Remote Enable Function Module

Dear Experts,
I want to know the main difference between BAPI Function Module and Remote Enable Function Module ?
One main difference that I know is BAPI FM are declared in Methods of Business Object ie BAPI are methods of BOR where as Remote Enabled FM are not. What are other differences? Is it possible to convert a Remote Enable FM to BAPI FM .
regards
Manish

Hello,
Did u create any ZBAPI?
The Procdure for Creating the Customer BAPI is Create a Remote Enabled Function module and then goto the tcode BAPI.
Once u go in to that just take the Project tab and enter the details.
by this way u can create a Customer BAPI.
With Regards,
Sumodh.P

Diff between Function Module and subroutine

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