Interrogating field data in a called Function Module

Good day to all;
I'd like to call a function module within my program and interrogate one of its fields once it is complete. The field itself is not returned through the function module's interface, so in stead of trying to rewrite the thing, I'm wondering if I can just request it?
I've ran a search on this and noted that someone said it may be possible to assign a field symbol to a program's variable, but that in order to actually gain access your program must be on the same calling stack.

Hi,
i think you mean the "dirty assign"
Re: How to access global variable declaraed in the separate program?
A.
Message was edited by: Andreas Mann

Similar Messages

Assign value to field of table before calling function module

hi,
FM 'ABC' have some TABLES parameters.
Before calling a function module 'ABC',i want to assign a value to one of the fields of the TABLES parameter.
TAB1 is a name of parameter and field FLD1 is a name of the field of TAB1 which i want to update before calling 'ABC'.
Thank you in advance.

hi,
1. store value in workarea
tab1-fld1 = 'value'.
2. append/modify the entry in tab1.
append tab1.
or
modify tab1
3. call your function module

BTE Name in Called Function Module

Hello,
A function module say XYZ is called from a BTE. Can I know the name of the BTE which called the function module XYZ inside the function module XYZ ?
With Regards,
Avisesh.

I think this document may help you...
<b>Business Transaction Events</b>
This activity describes how you can connect additional components (such as in the form of function modules developed yourself or a product from an external software provider) to the standard R/3 System.
There are two types of interface available in the General Ledger
Accounting (FI-GL), Accounts Receivable and Accounts Payable
(FI-AR/FI-AP), and Sales and Distribution (SD) components for this:
1. Publish & Subscribe interfaces (also called "informing interfaces" in the following) These should inform you about particular events (such as a document being entered) in the SAP standard application and make the data generated as a result available to the external software. The external software does not return any data to the standard R/3 System.
(I'm confused. MIT is using two business transaction events for the SD to FI interface. Both of these events are Publish & Subscribe interfaces. They both return data to the SAP standard application! They both change the FI document before it is posted. What I've figured out is that if there is an export to memory and an import from memory before and after the function call, then we can't modify the data. We can check this in the calling function module - OUTBOUND_CALL_00503110_E or OPEN_FI_PERFORM_00001020_E, etc)
Examples of such events in the R/3 System are:
Master record was created, changed, or blocked
Document was entered, parked, changed, or reversed
Items were cleared or reset
Additional processing can be caused in the additional component on the basis of these events and data:
Starting a workflow
Generating or changing additional data
Requesting correspondence
FI Clearing (F-32) calls (gathered via SE30):
Function OPEN_FI_PERFORM_00001020_E (can't modify data)
00001020 POST DOCUMENT: Prior to final checks
EVENT
This Event is reached prior to completing the document. The checks that are carried out at this point include checking, prior to posting, that the document balances to zero, and calculations for tax offsetting. This Event is accessed once per standard posting process and is similar to validation at document level (Event 0003). A document number has not yet
been assigned when this Event is reached.
INTERFACE
All document line items created and the document header data are
transferred (both as tables).
Parameter
T_BSEG
T_BKPF
Function OPEN_FI_PERFORM_00001025_E (can't modify data)
00001025 POST DOCUMENT: Final checks completed
EVENT
This Event lies following all checks on the whole document, but prior to number assignment. Following this Event, no further error messages may be sent. The document is complete at this point, and no further changes can be made to it prior to posting.
INTERFACE
All current data, all document data relevant for the posting, and various control parameters are transferred to the additional component. At this point you can still implement your own checks on the current document data.
Parameter
I_BKDF
T_AUSZ1
T_AUSZ2
T_AUSZ3
T_BKP1
T_BKPF
T_BSEC
T_BSED
T_BSEG
T_BSET
T_BSEU
Function OPEN_FI_PERFORM_00001030_E (can't modify data)
Function OPEN_FI_PERFORM_00001140_E (can't modify data)
2. Process interfaces (also referred to as "process" in the following) Process interfaces are used to submit business processes to a different control which cannot be realized with the standard system, that is process interfaces replace standard processes. Here you can structure determination of individual field contents or of specific reactions to process flows individually. It is possible to connect different external developments to the standard R/3 System. The additional developments are generally carried out using the ABAP/4 Development Workbench. This way you can, for example, influence the control of payment transactions. Selection of payment method, house bank and partner bank can be made using the payment data (currency, amount, and payee) according to a selection logic which you have defined.
FI Clearing (F-32) calls:
Function OPEN_FI_PERFORM_00001120_P
Function OPEN_FI_PERFORM_00001130_P
Function OPEN_FI_PERFORM_00001150_P
Function OPEN_FI_PERFORM_00001170_P
Standard Settings
Sample modules are delivered in the standard R/3 System which you can
copy into your name range and fill them with statements there.
Activities
1. Enter a product using "Settings -> Customer's products". Actually, in 4.6C, from transaction FIBF (IMG -> Financial Accounting -> Financial Accounting Global
Settings -> Business Transaction Events):
Settings -> Products -> ...of a customer
There are generally a large number of function modules belonging to a product which can be called by different program events from within the standard R/3 System. A product can also be an external software component. If the product is in an external system, enter an RFC destination here. If the product is in the same system, you do not have to enter anything. Important: Do not forget to activate the product after making the following settings.
2. Establish the interfaces with which the R/3 System provides you. To do this, choose
Environment -> Info system (P/S)
or
Environment -> Info system (Processes).
Execute the program. You should enter "A" as the
attribute type. You see the respective interfaces with which the R/3 System provides you. Note the key of the interface which you require.
You can also select:
By particular SAP application components
By particular events by entering intervals
Which interfaces are used in activated products
Which interfaces are used within a particular country version or within a particular industry
Which interfaces are used within a particular customer product
3. Enter the function module which you have developed yourself. To do this, choose either Goto -> Edit modules within the info system or Settings -> P/S modules or Process modules -> Customer's in the "SAP Business Framework" menu. Make the following entries:
Key for the interface
The product that you want to use
Function module which belongs to this product.
You can also enter several function modules for a product. Caution:
The function module must be within your name range, that is must begin with the letter Z. You leave the Ctr and Appl. fields blank unless you want a particular country version or a particular SAP industry-specific component to be enhanced or replaced instead of the standard process flow.
4. Fill the source text of your function module
and activate it. To do this, go again via Environment -> Info system (P/S) or Environment -> Info system (Processes) into the information system and execute the program. Then proceed as follows:
Click twice on the interface you have chosen. If you want, you can look at the interface at this point by choosing Goto -> Interface. Then choose the Back function again afterwards.
Place the cursor on the relevant line and choose Goto -> Function library. You see the sample function module delivered by SAP.
Copy the sample module delivered by SAP and call it the same as the function module entered in step 3.
Fill the source text of the empty function module.
Activate the function module.
Activate the product as described in step 1.
5. Run the R/3 program affected and test whether calling your function module works.
Further Notes
The other menu paths are only used for information about additional components delivered by SAP or about software already installed by external software providers.

Calling function module in bsp

hi all,
please help me out. i am calling function module in bsp(in on initialization). i am calling 2d_matrix fm. but in output, its not showing the graphics. i think i have to do something in layout also, to connact the FM. Plz help me if you have any idea in bsp.
thanks in advance.

thanks for ur reply.
but i am using it in layout and its giving me an error.
i have selected all the fields in on initialization.
and in layout i am displaying my data in tabular form. correspondigly i want to display same data in graphical format.
for that i have used a FM in on initialization(2d_matrix FM).
but how i link it in layout . so, that i can give me a output.
i can understand.
plz reply me.
thanks in advance.

What is the use of CALL FUNCTION MODULE - AT BACKGROUND TASK?

Hi experts,
I found Call functional module in background task will make the FM run at the next commit work as some people said. So I have some questions:
1 if we use COMMIT WORK commend, the pending FM will be called? If there are several FMs called at background task, what is the sequence of them? How many conditions will trigger the running of these FMs?
2 Where can I find the log of this pending FMs? In SAP library, it says there are 2 tables. But I checked these tables and can only find the FM name and user of it. And I can not understand content of these tables. It seems one is for the main information of FM, and the other is for the data of the FM, maybe the parameters.
3 If I call a FM in this way, Can I canncel it before the next commit work in some way?
Finally, thanks for reading and help.

HI,
When the COMMIT WORK statement is executed, the function modules registered for the current SAP-LUW are started in the order in which they were registered. ROLLBACK WORK deletes all previous registrations for the current SAP-LUW.
If the specified destination is not available when COMMIT WORK is executed, an executable program called RSARFCSE is started in background processing. By default, this tries to start the function modules registered for a SAP-LUW in their destination every 15 minutes and up to 30 times. These parameters can be changed in the transaction SM59. If the destination does not become available within the defined time, it is recorded in the database table ARFCSDATA as the entry "CPICERR". The entry in the database table ARFCSSTATE is deleted after a standard period of eight days

Problem with R/3 Data Source based on Function module in SAP BI

Hi,
We have a data source based on functional module. When we load data from R/3 to BI we face the following error.
" No end-confirmation arrived in the Warehouse from the source system."
We are getting data but due to no end confirmation from the source system, the load become timed-out and status becomes "RED". When we change the status to be "GREEN" and proceed tha load further, load is fine.
Please suggest us a suitable solution.
Thanks in Advance,
Geetha

Hi Geetha Devi Ramalingam.
I faced the same problem since yesterday. I just resolve the issue.
So here is my solution :
try this code :
    FETCH NEXT CURSOR s_cursor
               APPENDING CORRESPONDING FIELDS
               OF TABLE e_t_data
               PACKAGE SIZE s_s_if-maxsize.
    IF sy-subrc <> 0.
      CLOSE CURSOR s_cursor.
      RAISE no_more_data.
    ENDIF.
if you add your
bold
IF sy-subrc <> 0.
      CLOSE CURSOR s_cursor.
      RAISE no_more_data.
    ENDIF.
bold
than the sy-subrc may be equal and than your CLOSE CURSOR s_cursor. will have no effect
it work for me hope it will for u
Hard luck!
Salah
Edited by: idrissi salaheddine on Jan 19, 2012 12:24 PM

Calling Function Module in Update Task

Hello Experts,
Can anyone let me know about
Calling Function Module in Update Task.
Why do we use this " In Update Task " ??
How do we Use ??
What is the Use... ??
Kindly let me know....
Thanks and Regards
Pramod

hi,
Why do we use this " In Update Task " ??
The main update technique for bundling database changes in a single database LUW is to use CALL FUNCTION... IN UPDATE TASK.
How do we Use ??
A typical R/3 installation contains dialog work processes and at least one update work process. The update work processes are responsible for updating the database. When an ABAP program reaches a COMMIT WORK statement, any function modules from CALL FUNCTION... IN UPDATE TASK statements are released for processing in an update work process. The dialog process does not wait for the update to finish. This kind of update is called asynchronous update.
What is the Use... ??
Asynchronous update is useful when response time from the transaction is critical, and the database updates themselves are so complex that they justify the extra system load
Real time scenario.
Suppose a user wants to change an entry in a database table, or add a new one. He or she enters the necessary data, and then starts the update process by choosing Save. This starts the following procedure in the ABAP program:
Firstly, the program locks the database entry against other users, using the enqueue work process (or the message server in the case of a distributed system). This generates an entry in the lock table. The user is informed whether the update was successful, or whether the lock could not be set because of other users.
If the lock is set, the program reads the entry that is to be changed and modifies it. If the user has created a new entry, the program checks whether a record with the same key values already exists.
In the current dialog work process, the program calls a function module using CALL FUNCTION... IN UPDATE TASK, and this writes the change details as an entry in table VBLOG.
When the program is finished (maybe after further dialog steps), a COMMIT WORK statement starts the final part of the SAP LUW. The work process that is processing the current dialog step starts an update work process.
Based on the information passed to it from the dialog work process, the update work process reads the log entries belonging to the SAP LUW from table VBLOG.
The update work process passes this data to the database for updating, and analyzes the return message from the database. If the update was successful, the update work process triggers a database commit after the last database change and deletes the log entries from table VBLOG.
If an error occurred, the update work process triggers a database rollback, leaves the log entries in table VBLOG, flags them as containing errors, and sends a SAPoffice message to the user, who should then inform the system administrator.
The corresponding entries in the lock table are reset by the update work process.
Hope this is helpful, Do reward.

Type error while calling function module with in FOX formula

Hi,
I am getting following error while calling function module from FOX Formula:
"Types of parameter DAY_IN () and variable J_CALDAY(D) are inconsistent"
Following is the code:
DATA    I_CALDAY       TYPE 0CALDAY.
DATA    N_CALDAY       TYPE 0CALDAY.
DATA    KYF              TYPE KEYFIGURE_NAME.
FOREACH   I_CALDAY, KYF.
   CALL FUNCTION SLS_MISC_GET_LAST_DAY_OF_MONTH
      EXPORTING
         DAY_IN = I_CALDAY
      IMPORTING
         LAST_DAY_OF_MONTH = N_CALDAY.
    {KYF, N_CALDAY} = {KYF, L_CALDAY}.
ENDFOR.
Import parameter DAY_IN is of type sy-datum (that inturn is data element SYDATUM of data type DATS - same as 0CALDAY). Not sure why error is being thrown. Any idea? Thanks.
Edited by: SAP_BOY on Dec 4, 2009 5:26 PM

Hi,
I think It will not identify ,though you have (data element SYDATUM of data type DATS - same as 0CALDAY).Check it out by assigning it through a variable of type D.
Data I_CALDAY TYPE D.
Hope it may work out.
Regards,
Indu

Can we call function modules in SAP query or ADHOC query

Hi ,
Can we call afunction moudule in sap query or ADHOC query ?If yes How
An early responce is greatly appreciated
Thanks and best regards
Rajeev Chhabra

Hello Rajeev Chhabra,
Yes; you can call function module in SAP Query. In InfoSet definition (SQ02), you can create additional field. In this field definition, you can add code snippet where you can function module.
However, this is not possible in Quick Viewer (SQVI) Query.
Thanks,
Venu

Can we call functional module in a subroutine? Any example?

Can we call functional module in a subroutine? Any example?

sample code....
REPORT ZPL_BDC_PA30.
TABLES : PA0022.
DATA : V_PERNR LIKE PA0022-PERNR,
       V_SLABS LIKE PA0022-SLABS.
DATA : FILENAME TYPE STRING.
DATA : BEGIN OF IT_DATA OCCURS 0,
         PERNR LIKE PA0022-PERNR,       "Personnel Number
         SLABS LIKE PA0022-SLABS,       "Certificate code
         SLABS1 LIKE PA0022-SLABS,      "Certificate code new
       END OF IT_DATA.
DATA : IT_BDCDATA LIKE BDCDATA OCCURS 1 WITH HEADER LINE.
DATA : BEGIN OF IT_ERROR OCCURS 0,
         POS LIKE SY-TABIX,
         TEXT(40),
       END OF IT_ERROR.
PARAMETERS : P_FNAME TYPE DXFIELDS-LONGPATH.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FNAME.
CALL FUNCTION 'F4_DXFILENAME_TOPRECURSION'
EXPORTING
I_LOCATION_FLAG       = ' '
I_SERVER              = '?'
I_PATH                = I_PATH
FILEMASK              = '.'
FILEOPERATION         = 'R'
   IMPORTING
O_LOCATION_FLAG       = O_LOCATION_FLAG
O_SERVER              = O_SERVER
     O_PATH                = P_FNAME
ABEND_FLAG            = ABEND_FLAG
   EXCEPTIONS
     RFC_ERROR             = 1
     ERROR_WITH_GUI        = 2
     OTHERS                = 3
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
START-OF-SELECTION.
FILENAME = P_FNAME.
PERFORM UPLOAD.            "Uploading inputfile to internal table.
PERFORM VALIDATE.          "validating the values
PERFORM POPULATE_BDC.      "Populating bdc internal table
PERFORM ERROR_RECORDS
        TABLES IT_ERROR.     "Error records
*&      Form bdc_fdata
FORM BDC_FDATA USING FNAM FVAL.
CLEAR IT_BDCDATA.
IT_BDCDATA-FNAM = FNAM.
IT_BDCDATA-FVAL = FVAL.
APPEND IT_BDCDATA.
ENDFORM.                    " bdc_fdata
*&      Form bdc_hdata
FORM BDC_HDATA USING PROGRAM SCRNO DYNBEGIN.
CLEAR IT_BDCDATA.
IT_BDCDATA-PROGRAM = PROGRAM.
IT_BDCDATA-DYNPRO = SCRNO.
IT_BDCDATA-DYNBEGIN = DYNBEGIN.
APPEND IT_BDCDATA.
ENDFORM.                    " bdc_hdata
*&      Form upload
FORM UPLOAD .
CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      FILENAME                      = FILENAME
     FILETYPE                      = 'ASC'
     HAS_FIELD_SEPARATOR           = 'X'
HEADER_LENGTH                 = 0
READ_BY_LINE                  = 'X'
DAT_MODE                      = ' '
CODEPAGE                      = ' '
IGNORE_CERR                   = ABAP_TRUE
REPLACEMENT                   = '#'
CHECK_BOM                     = ' '
VIRUS_SCAN_PROFILE            = VIRUS_SCAN_PROFILE
NO_AUTH_CHECK                 = ' '
IMPORTING
FILELENGTH                    = FILELENGTH
HEADER                        = HEADER
    TABLES
      DATA_TAB                      = IT_DATA
   EXCEPTIONS
     FILE_OPEN_ERROR               = 1
     FILE_READ_ERROR               = 2
     NO_BATCH                      = 3
     GUI_REFUSE_FILETRANSFER       = 4
     INVALID_TYPE                  = 5
     NO_AUTHORITY                  = 6
     UNKNOWN_ERROR                 = 7
     BAD_DATA_FORMAT               = 8
     HEADER_NOT_ALLOWED            = 9
     SEPARATOR_NOT_ALLOWED         = 10
     HEADER_TOO_LONG               = 11
     UNKNOWN_DP_ERROR              = 12
     ACCESS_DENIED                 = 13
     DP_OUT_OF_MEMORY              = 14
     DISK_FULL                     = 15
     DP_TIMEOUT                    = 16
     OTHERS                        = 17
IF SY-SUBRC <> 0.
    MESSAGE I000(BCTRAIN) WITH 'FILE NOT UPLOADED'.
ELSE.
   MESSAGE I000(BCTRAIN) WITH 'FILE UPLOADED'.
ENDIF.
ENDFORM.                    " upload
*&      Form populate_bdc
FORM POPULATE_BDC .
LOOP AT IT_DATA .
    PERFORM BDC_HDATA USING 'SAPMP50A'
                                '1000'
                                'X'.
    PERFORM BDC_FDATA USING 'RP50G-PERNR'
                             IT_DATA-PERNR.
    PERFORM BDC_FDATA USING 'RP50G-CHOIC'
                             '0022'.
    PERFORM BDC_FDATA USING 'BDC_OKCODE'
                             '=MOD'.
    PERFORM BDC_HDATA USING 'MP002200'
                                 '2000'
                                 'X'.
    PERFORM BDC_FDATA USING 'P0022-SLABS'
                             IT_DATA-SLABS1.
    PERFORM BDC_FDATA USING 'BDC_OKCODE'
                             '=UPD'.
    CALL TRANSACTION 'PA30' USING IT_BDCDATA.
    REFRESH IT_BDCDATA.
ENDLOOP.
ENDFORM.                    " populate_bdc
*&      Form validate
FORM VALIDATE .
    data : num like sy-tabix,
           num1 like sy-tabix.
LOOP AT IT_DATA.
   num = num + 1.
num1 = sy-tabix.
    SELECT PERNR
         FROM PA0022
         INTO V_PERNR WHERE
         PERNR EQ IT_DATA-PERNR.
    ENDSELECT.
    IF SY-SUBRC <> 0.
      MOVE num TO IT_ERROR-POS.
      MOVE 'Invalid Pernr' TO IT_ERROR-TEXT.
      APPEND IT_ERROR.
      DELETE IT_DATA .
    ELSE.
      IF IT_DATA-SLABS IS INITIAL.
        MOVE num TO IT_ERROR-POS.
        MOVE 'Certificate code is initial' TO IT_ERROR-TEXT.
        APPEND IT_ERROR.
        DELETE IT_DATA.
      ENDIF.
    ENDIF.
ENDLOOP.
ENDFORM.                    " validate
*&      Form error_records
FORM ERROR_RECORDS TABLES IT_ERRORS.
FORMAT COLOR COL_GROUP.
WRITE : / 'Error in the following records : ' .
FORMAT COLOR COL_NEGATIVE.
LOOP AT IT_ERROR.
    WRITE : / IT_ERROR-POS,
               IT_ERROR-TEXT.
ENDLOOP.
ENDFORM.                    " error_records

Can we call function module in sap script

hi
can we call function module in sap script
i want to use function module HR_TMW_GET_EMPLOYEE_NAME in sapscript
to get Empname by using personal no
pernr no is coming from bseg-pernr table
so how i can use it .
please help me
thanks in advanced.

hi,
You can use like this:
PERFORM FUNCTION_MODULE IN PROGRAM SUBROUTINE_POOL
USING &FIELD1&
USING &FIELD2&
CHANGING &FIELD3&
ENDPERFORM.
where function_module is the func. module name defined in program SUBROUTINE_POOL , field1 n field2 are the fields to be passed, and field3 is the value which you want to display...
You have to read field1 & field2 in the pool, process them & get the value of field to be output.
Reward helpful answers.
Regards,
SIddhesh Sanghvi.

Data source enhancement thru function module

Folks,
I am trying to figure relation between data source enhancement, package, function module etc?
I see a function module where enhancement is done. when I go and try to see master data exit EXIT_SAPLRSAP_0002 ... I see include but I do not see reference of function module in this include?
All these codes are so simple... but I am struggling to figure out all these relation RSAP0001, exit_saplrsap* - include inside and function module attached?
Can somebody give very simple connection for all these components?
Thanks,
-SM

Hi,
All these codes are so simple... but I am struggling to figure out all these relation RSAP0001, exit_saplrsap - include inside and* function module attached?
Please note that for enhancing certain standard objects for meet customer needs, SAP provides different customer exits where we can code as per our requirements.
These customer exits starting with EXIT********* will be grouped by Enhancements e.g. RSAP0001
Thanks for your response. In RS02 it is clear that we can mention function module name for data source - that is good for generic extraction. But what do we do when we are enhancing SAP extractor?
When you want to enhance SAP extractors, you go for customer exits.
EXIT_SAPLRSAP_001              for Transactional datasources
EXIT_SAPLRSAP_002              for Master datasources
EXIT_SAPLRSAP_003              for Text datasources
EXIT_SAPLRSAP_004              for Hierarchy datasources
in se37 screen in table tab - sometime we see extract structure - that will establish which functional being called for which data source, but in my case - I do not see anything in table tab?
If your datasource is function module based, then the function module which is mentioned in RSO2 for your datasource would surely have e_t_data in tables tab with its associated type.
Only if the datasource is standard one and is processed by function module e.g. 2lis_18_i0notif which is processed by MCEX_BW_LO_API function module, these would not have associated type mentioned for them. To get their structure, you can go to RSA5/ RSA6

Uncatchable exception: BSP calling Function Module

Hi all,
currently i'm facing a very weird problem. My application class calls function module
HR_INFOTYPE_OPERATION. Normally, in case of an error, the function module gives you back a return parameter. But if i call it from my BSP, the processing doesn't leave the function module. It directly throws an exception ERROR_MESSAGE_STATE instead of writing the message into parameter return.
If i call the function module with the same parameters from a report, it works fine and the error message is written to return parameter without throwing an exception.
What am i doing wrong? I don't want that exception and need to go on with filled parameter result.
Regards
Mark-André

Hi MA,
try using ERROR_MESSAGE in the exceptions list, like this.
CALL FUNCTION 'func_name'
     EXPORTING
          string            = text
          pos               = position
     IMPORTING
          string1           = text1
          string2           = text2
     EXCEPTIONS
          string1_too_small = 1
          string2_too_small = 2
          ERROR_MESSAGE     = 3
          OTHERS            = 4.
Cheers
Graham Robbo

Third party system call function module/BAPI through RFC to update Z table

Dear Friends,
We have a third party system which directly inserts a Z table in SAP through its programming, which is an auditing issue.
We want the third party system should call function module/BAPI through RFC so that the Z table gets updated.
waiting for inputs..
Thanks,
Kumar

if third party system is capable of making Remote Function call, then writing a Function module & making it remote enable is not difficult task in ABAP.
You may have to prepare specifications first to decide if third party system is going to Read, insert, update, delete records from Zee table.

Why Service Call and why not call Function module Directly in WD ABAP

Hi,
I have created a Webdynpro applications and the logic requires calling avrious Function modules.
Do I need to create Service Call for each Function module or call them directly.
It would be great if you can suggest me under what cases I need to opt for Service call
For example, if I use 'RP_CALC_DATE_IN_INTERVAL', do I need to use Service call or call function module directly.
Note: I have searched forums but could not get the correct answer which I want
Thanks!

The Service Call is really meant to be a wizard/time saver. It has the advantage that it can generate matching context nodes/attributes for the interface of the Function Module you are calling. However everything that the service call does can also be created by hand.
Personally I'm not a fan of what the service call wizard generates. Its good as a time saver or for beginners, but I find I prefer to touch up the code it generates anyway. I much prefer to create a nice reusable model class with its own unit test and then consume this model class (with the service call wizard) from WD. This model class might contain one or more function module calls depending upon what logic I need to access.

Interrogating field data in a called Function Module

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