Function Module-ABAP Logic

Hi Experts,
The following is the ABAP Code used in Function Module to extract Master Data from R/3 to BW.Could please convert that into human language (Explain logic of code)
FUNCTION MDEX_MATERIAL_MD .
""Lokale Schnittstelle:
*" IMPORTING
*" VALUE(I_REQUNR) TYPE SBIWA_S_INTERFACE-REQUNR OPTIONAL
*" VALUE(I_CHABASNM) TYPE SBIWA_S_INTERFACE-CHABASNM OPTIONAL
*" VALUE(I_MAXSIZE) TYPE SBIWA_S_INTERFACE-MAXSIZE OPTIONAL
*" VALUE(I_INITFLAG) TYPE SBIWA_S_INTERFACE-INITFLAG OPTIONAL
*" VALUE(I_UPDMODE) TYPE SBIWA_S_INTERFACE-UPDMODE OPTIONAL
*" VALUE(I_DATAPAKID) TYPE SBIWA_S_INTERFACE-DATAPAKID OPTIONAL
*" VALUE(I_S_TIMEINT) TYPE SBIWA_S_TIMEINT OPTIONAL
*" VALUE(I_RLOGSYS) TYPE SRSC_S_INTERFACE-RLOGSYS OPTIONAL
*" VALUE(I_PRIVATE_MODE) OPTIONAL
*" TABLES
*" I_T_SELECT TYPE SBIWA_T_SELECT OPTIONAL
*" I_T_FIELDS TYPE SBIWA_T_FIELDS OPTIONAL
*" E_T_BIW_MARA_S STRUCTURE BIW_MARA_S OPTIONAL
*" E_T_BIW_MARC_S STRUCTURE BIW_MARC_S OPTIONAL
*" E_T_BIW_MARD_S STRUCTURE BIW_MARD_S OPTIONAL
*" E_T_BIW_MVKE_S STRUCTURE BIW_MVKE_S OPTIONAL
*" E_T_BIW_MARM_S STRUCTURE BIW_MARM_S OPTIONAL
*" EXCEPTIONS
*" NO_MORE_DATA
*" ERROR_PASSED_TO_MESS_HANDLER
function acts as a S-API-compatible interface for the SD-extractor
MATERIAL_DYNAM_DATA_SELECTION
STATICS: L_FIRST_CALL TYPE SBIWA_FLAG,
 L_NO_SELECT TYPE C.
DATA: L_SUBRC TYPE SBIWM_SUBRC.
DATA: L_T_CHABASCMP LIKE RSSOSFIELD OCCURS 0 WITH HEADER LINE,
 L_S_REQUEST TYPE RSAP_S_REQUEST,
 L_SLOGSYS LIKE TBDLS-LOGSYS,
 L_RODCHABGEN LIKE RODCHABGEN,
 L_LINES TYPE I,
 L_TX_SELECT TYPE SBIWA_TX_SELECT,
 L_T_SELECT TYPE SBIWA_T_SELECT,
 L_S_SELECT TYPE SBIWA_S_SELECT.
DATA: L_T_MARA LIKE MARA OCCURS 10 WITH HEADER LINE,
 L_T_MARC LIKE MARC OCCURS 10 WITH HEADER LINE,
 L_T_MARD LIKE MARD OCCURS 10 WITH HEADER LINE,
 L_T_MVKE LIKE MVKE OCCURS 10 WITH HEADER LINE,
 L_T_MARM LIKE MARM OCCURS 10 WITH HEADER LINE.
DATA: L_S_MATNR_MATERIAL_KEYS LIKE PRE03,
 L_S_WERKS_MATERIAL_KEYS LIKE PRE01,
 L_S_LGORT_MATERIAL_KEYS LIKE PRE08,
 L_S_VTLIN_MATERIAL_KEYS LIKE PRE10.
 Variable to read compound information "note383430 insED08052001
DATA: i_chabasnm_cmp TYPE sbiwa_s_interface-chabasnm.
"note383430 insED08052001
IF I_INITFLAG = 'X'.
Initialization: check input parameters
 buffer input parameters
 prepare data selection
Invalid second initialization call -> error exit
 IF NOT G_FLAG_INTERFACE_INITIALIZED IS INITIAL.
 IF 1 = 2. MESSAGE E008(R3). ENDIF.
 LOG_WRITE 'E' "message type
 'R3' "message class
 '008' "message number
 ' ' "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 ELSE.
 G_FLAG_INTERFACE_INITIALIZED = SBIWA_C_FLAG_ON.
 ENDIF.
Check for supported update mode
 CASE I_UPDMODE.
 WHEN SBIWA_C_UPDMODE_FULL.
 WHEN SBIWA_C_UPDMODE_DELTAINIT.
 WHEN SBIWA_C_UPDMODE_DELTA.
 WHEN OTHERS.
 IF 1 = 2. MESSAGE E011(R3). ENDIF.
 LOG_WRITE 'E' "message type
 'R3' "message class
 '011' "message number
 I_UPDMODE "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 ENDCASE.
Initialize variable to read compound information
 i_chabasnm_cmp = i_chabasnm. "note383430 insED08052001
**Check InfoObject validity and set IO-dependent parameters
 G_TAB1_FLG = G_TAB2_FLG = G_TAB3_FLG = G_TAB4_FLG = ' '.
 g_tab5_flg = ' '. "note417314 insED04072001
 G_NO_MARM = 'X'.
 CASE I_CHABASNM.
 WHEN '0MATERIAL'.
 G_TAB1_FLG = 'X'.
 G_TABLENAME = 'MARA'.
 WHEN '0ARTICLE'. "note383430 insED30042001
 G_TAB1_FLG = 'X'. "note383430 insED30042001
 G_TABLENAME = 'MARA'. "note383430 insED30042001
 i_chabasnm_cmp = '0MATERIAL'. "note383430 insED08052001
 WHEN '0ME_MATERIAL'. "note759687
 G_TAB1_FLG = 'X'. "note759687
 G_TABLENAME = 'MARA'. "note759687
 i_chabasnm_cmp = '0MATERIAL'. "note759687
 WHEN '0MAT_PLANT'.
 G_TAB2_FLG = 'X'.
 G_TABLENAME = 'MARC'.
 WHEN '0ART_PLANT'. "note383430 insED30042001
 G_TAB2_FLG = 'X'. "note383430 insED30042001
 G_TABLENAME = 'MARC'. "note383430 insED30042001
 i_chabasnm_cmp = '0MAT_PLANT'. "note383430 insED08052001
 WHEN '0MAT_ST_LOC'.
 G_TAB3_FLG = 'X'.
 G_TABLENAME = 'MARD'.
 WHEN '0ART_ST_LOC'. "note383430 insED30042001
 G_TAB3_FLG = 'X'. "note383430 insED30042001
 G_TABLENAME = 'MARD'. "note383430 insED30042001
 i_chabasnm_cmp = '0MAT_ST_LOC'. "note383430 insED08052001
 WHEN '0MAT_SALES'.
 G_TAB4_FLG = 'X'.
 G_TABLENAME = 'MVKE'.
 when '0ART_SALES'. "note383430 insED30042001 "delED
 g_tab4_flg = 'x'. "note383430 insED30042001 "delED
 g_tablename = 'MVKE'. "note383430 insED30042001 "delED
 WHEN '0ART_SALES'. "insED
 G_TAB4_FLG = 'X'. "insED
 G_TABLENAME = 'MVKE'. "insED
 i_chabasnm_cmp = '0MAT_SALES'. "note383430 insED08052001
 WHEN '0MAT_UNIT'.
 G_TAB1_FLG = 'X'. "note417314 delED04072001
 g_tab5_flg = 'X'. "note417314 insED04072001
 G_TABLENAME = 'MARM'.
 G_NO_MARM = ' '.
 WHEN OTHERS.
 IF 1 = 2. MESSAGE E009(R3). ENDIF.
 LOG_WRITE 'E' "message type
 'R3' "message class
 '009' "message number
 I_CHABASNM "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 ENDCASE.
** fill parameter buffer for data extraction calls
 G_S_EXTR_IF-REQUNR = I_REQUNR.
 G_S_EXTR_IF-CHABASNM = I_CHABASNM.
 G_S_EXTR_IF-MAXSIZE = I_MAXSIZE.
 G_S_EXTR_IF-INITFLAG = I_INITFLAG.
 G_S_EXTR_IF-UPDMODE = I_UPDMODE.
 G_S_EXTR_IF-DATAPAKID = I_DATAPAKID.
 g_s_interface-read_opt =.
 G_S_INTERFACE-MAX_MATNR = I_MAXSIZE.
 g_s_interface-max_lifnr =.
 g_s_interface-max_kunnr =.
 g_s_interface-max_werks =.
 CASE I_UPDMODE.
 WHEN SBIWA_C_UPDMODE_DELTA.
 ** settings for delta data transfer
 ** get additional information about current extraction
 CALL FUNCTION 'RSAN_LOGSYS_DETERMINE'
 EXPORTING
 I_CLIENT = SY-MANDT
 IMPORTING
 E_LOGSYS = L_SLOGSYS.
 L_S_REQUEST-SNDPRN = L_SLOGSYS.
 L_S_REQUEST-RCVPRN = I_RLOGSYS.
*----- Fill Content release so get_rodchabgen will work ok -
 PERFORM GET_BWBCRL IN PROGRAM SAPLRSAP "OSS 1054070/2000
 USING L_S_REQUEST-RCVPRN "OSS 1054070/2000
 CHANGING L_SUBRC. "OSS 1054070/2000
 PERFORM GET_RODCHABGEN IN PROGRAM SAPLRSAP
 USING L_RODCHABGEN
 I_CHABASNM
 L_S_REQUEST.
 ** get base characteristic information
 PERFORM DETERMINE_COMPOSITES IN PROGRAM SAPLRSAM
 TABLES L_T_CHABASCMP
 USING I_CHABASNM.
 USING i_chabasnm_cmp. "note383430 insED08052001
 ** Get information about modified data objects
 PERFORM FILL_MD_SELECT_ENTRYTABLE IN PROGRAM SAPLRSAP
 TABLES L_T_CHABASCMP
 USING L_RODCHABGEN-MSGTYP
 I_CHABASNM
 CHANGING L_TX_SELECT
 L_SUBRC.
 DESCRIBE TABLE L_TX_SELECT LINES L_LINES.
 IF L_LINES = 0.
 L_NO_SELECT = 'X'.
 ENDIF.
 ** fill key-table for extractor
 REFRESH G_T_MATNR_MATERIAL_KEYS.
 REFRESH G_T_WERKS_MATERIAL_KEYS.
 REFRESH G_T_LGORT_MATERIAL_KEYS.
 REFRESH G_T_VTLIN_MATERIAL_KEYS.
 refresh g_t_marm_material_keys. "note417314 insED04072001
 LOOP AT L_TX_SELECT INTO L_T_SELECT.
 CASE I_CHABASNM.
 WHEN '0MATERIAL' OR '0ARTICLE' "note383430 insED30042001
 OR '0ME_MATERIAL'.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'MATNR'.
 L_S_MATNR_MATERIAL_KEYS-MATNR = L_S_SELECT-LOW.
 APPEND L_S_MATNR_MATERIAL_KEYS TO G_T_MATNR_MATERIAL_KEYS.
 WHEN '0MAT_PLANT' OR '0ART_PLANT'. "note383430 insED30042001
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'MATNR'.
 L_S_WERKS_MATERIAL_KEYS-MATNR = L_S_SELECT-LOW.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'WERKS'.
 L_S_WERKS_MATERIAL_KEYS-WERKS = L_S_SELECT-LOW.
 APPEND L_S_WERKS_MATERIAL_KEYS TO G_T_WERKS_MATERIAL_KEYS.
 WHEN '0MAT_ST_LOC' OR '0ART_ST_LOC'.
 "note383430 insED30042001
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'MATNR'.
 L_S_LGORT_MATERIAL_KEYS-MATNR = L_S_SELECT-LOW.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'WERKS'.
 L_S_LGORT_MATERIAL_KEYS-WERKS = L_S_SELECT-LOW.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'LGORT'.
 L_S_LGORT_MATERIAL_KEYS-LGORT = L_S_SELECT-LOW.
 APPEND L_S_LGORT_MATERIAL_KEYS TO G_T_LGORT_MATERIAL_KEYS.
 WHEN '0MAT_SALES' OR '0ART_SALES'. "note383430 insED30042001
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'MATNR'.
 L_S_VTLIN_MATERIAL_KEYS-MATNR = L_S_SELECT-LOW.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'VKORG'.
 L_S_VTLIN_MATERIAL_KEYS-VKORG = L_S_SELECT-LOW.
 READ TABLE L_T_SELECT
 INTO L_S_SELECT
 WITH KEY FIELDNM = 'VTWEG'.
 L_S_VTLIN_MATERIAL_KEYS-VTWEG = L_S_SELECT-LOW.
 APPEND L_S_VTLIN_MATERIAL_KEYS TO G_T_VTLIN_MATERIAL_KEYS.
 ENDCASE.
 ENDLOOP.
 IF L_SUBRC <> 0.
 IF 1 = 2. MESSAGE E009(R3). ENDIF.
 LOG_WRITE 'E' "message type
 'R3' "message class
 '009' "message number
 I_CHABASNM "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 EXIT.
 ENDIF.
 ** settings for full data transfer or delta init.
*----- Selektionsbedingungen müssen immer übernommen werden -
 WHEN sbiwa_c_updmode_full "DEL"TH090800
 OR sbiwa_c_updmode_deltainit. "DEL"TH090800
 REFRESH g_t_sel_table. "DEL"TH090800
 LOOP AT i_t_select INTO l_s_select. "DEL"TH090800
 g_s_sel_table-table = g_tablename. "DEL"TH090800
 g_s_sel_table-field = l_s_select-fieldnm. "DEL"TH090800
 MOVE-CORRESPONDING l_s_select TO g_s_sel_table. "DEL"TH090800
 APPEND g_s_sel_table TO g_t_sel_table. "DEL"TH090800
 ENDLOOP. "DEL"TH090800
 WHEN OTHERS.
 ENDCASE.
*----- Selektionsbedingungen müssen immer übernommen werden -
 REFRESH G_T_SEL_TABLE. "INS"TH090800
 LOOP AT I_T_SELECT INTO L_S_SELECT. "INS"TH090800
 G_S_SEL_TABLE-TABLE = G_TABLENAME. "INS"TH090800
 G_S_SEL_TABLE-FIELD = L_S_SELECT-FIELDNM. "INS"TH090800
 MOVE-CORRESPONDING L_S_SELECT TO G_S_SEL_TABLE. "INS"TH090800
 APPEND G_S_SEL_TABLE TO G_T_SEL_TABLE. "INS"TH090800
 ENDLOOP. "INS"TH090800
 REFRESH G_T_FIELDS.
 APPEND LINES OF I_T_FIELDS TO G_T_FIELDS.
ELSE. "Initialization mode or data extraction ?
 IF ( G_MORE_DATA_EXISTS = ' ' ) AND ( G_COUNTER_DATAPAKID NE 0 ).
 RAISE NO_MORE_DATA.
 EXIT.
 ENDIF.
 IF G_S_EXTR_IF-UPDMODE = SBIWA_C_UPDMODE_DELTA.
 IF NOT L_NO_SELECT IS INITIAL.
 RAISE NO_MORE_DATA.
 ENDIF.
 ENDIF.
 IF ( G_MORE_DATA_EXISTS = 'X' ) OR ( G_COUNTER_DATAPAKID = 0 ).
 REFRESH L_T_MARA.
 REFRESH L_T_MARC.
 REFRESH L_T_MARD.
 REFRESH L_T_MVKE.
 REFRESH L_T_MARM.
 CALL FUNCTION 'MATERIAL_DYNAM_DATA_SELECTION'
 EXPORTING
 NO_MARM_DATA = G_NO_MARM
 READ_MARA_DATA = G_TAB1_FLG
 READ_MARC_DATA = G_TAB2_FLG
 READ_MARD_DATA = G_TAB3_FLG
 READ_MVKE_DATA = G_TAB4_FLG
 read_marm_data = g_tab5_flg "note417314 insED04072001
 JOIN_OPTION = 'O'
 IN_MAX_MATNR = G_S_INTERFACE-MAX_MATNR
 TABLES
 IN_SELECT_FIELDS = G_T_SEL_TABLE
 IN_MATNR_KEYS = G_T_MATNR_MATERIAL_KEYS
 IN_WERKS_KEYS = G_T_WERKS_MATERIAL_KEYS
 IN_VTLIN_KEYS = G_T_VTLIN_MATERIAL_KEYS
 IN_LGORT_KEYS = G_T_LGORT_MATERIAL_KEYS "insED22032001
 in_marm_keys = g_t_marm_material_keys "note417314
 "insED04072001
 OUT_MARA_TAB = L_T_MARA
 OUT_MARC_TAB = L_T_MARC
 OUT_MARD_TAB = L_T_MARD
 OUT_MVKE_TAB = L_T_MVKE
 OUT_MARM_TAB = L_T_MARM
 CHANGING
 MORE_DATA_EXISTS = G_MORE_DATA_EXISTS
 EXCEPTIONS
 WRONG_INPUT_DATA = 1
 OTHERS = 2
 IF SY-SUBRC <> 0.
 IF 1 = 2. MESSAGE E011(R3). ENDIF.
 LOG_WRITE 'E' "message type
 'R3' "message class
 '011' "message number
 SY-SUBRC "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 ENDIF.
 G_COUNTER_DATAPAKID = G_COUNTER_DATAPAKID + 1.
 LOOP AT L_T_MARA.
 MOVE-CORRESPONDING L_T_MARA TO E_T_BIW_MARA_S.
 APPEND E_T_BIW_MARA_S.
 ENDLOOP.
 LOOP AT L_T_MARC.
 MOVE-CORRESPONDING L_T_MARC TO E_T_BIW_MARC_S.
 provide additional attributes not contained in MARC
 PERFORM MARC_ADD_ATTRIBUTES CHANGING E_T_BIW_MARC_S
 L_SUBRC.
 IF L_SUBRC <> 0.
 IF 1 = 2. MESSAGE E501(R§). ENDIF.
 "insED03082001 begin note216922
 log_write 'W' "message type
 'R§' "message class
 '501' "message number
 e_t_biw_marc_s-werks "message variable 1
 ' '. "message variable 2
 "insED03082001 end note216922
 "delED03082001 begin note216922
 LOG_WRITE 'E' "message type
 'R§' "message class
 '501' "message number
 E_T_BIW_MARC_S-WERKS "message variable 1
 ' '. "message variable 2
 RAISE ERROR_PASSED_TO_MESS_HANDLER.
 "delED03082001 end note2169222
 ENDIF.
 APPEND E_T_BIW_MARC_S.
 ENDLOOP.
 LOOP AT L_T_MARD.
 MOVE-CORRESPONDING L_T_MARD TO E_T_BIW_MARD_S.
 APPEND E_T_BIW_MARD_S.
 ENDLOOP.
 LOOP AT L_T_MVKE.
 MOVE-CORRESPONDING L_T_MVKE TO E_T_BIW_MVKE_S.
 APPEND E_T_BIW_MVKE_S.
 ENDLOOP.
 LOOP AT L_T_MARM.
 MOVE-CORRESPONDING L_T_MARM TO E_T_BIW_MARM_S.
 APPEND E_T_BIW_MARM_S.
 ENDLOOP.
 ENDIF.
ENDIF.
ENDFUNCTION.
Thanks

Hi,
This might not be the right forum for this. You can post your question in more relevant forum like Netweaver-Exchange Infrastructure.

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Hi Raj
Function Modules
Function modules are procedures that are defined in special ABAP programs only, so-called function groups, but can be called from all ABAP programs. 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 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.
The Function Builder also has a release process for function modules. This ensures that incompatible changes cannot be made to any function modules that have already been released. This applies particularly to the interface. Programs that use a released function module will not cease to work if the function module is changed.
Check this link
http://help.sap.com/saphelp_nw2004s/helpdata/en/9f/db988735c111d1829f0000e829fbfe/content.htm
You can execute function module in SE37ie you can perform the activiites defined in the function module by executing it.
By deleting BOM you mention the FM name in se37 and execute. In some function module it will ask input parameters as developed in the program , you have to give the input parameters and execute.

Regarding the function modules

Hi anybody pls tell me
what are the scenarios for the creation of function module
can you give me the some examples
thanks in advance

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. 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.
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.
The Function Builder also has a release process for function modules. This ensures that incompatible changes cannot be made to any function modules that have already been released. This applies particularly to the interface. Programs that use a released function module will not cease to work if the function module is changed

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

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

Brefely explain function module

hi
this is ramireddy.

hi ram,
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,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.
3 types.
1)normal function module
2)remote function module
Difference between FM and subroutines
difference between function module and subroutines
function module vs loacal subroutines
3)update function module
reward points if helpful.

Function Module-ABAP Logic

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