User Exits and VOFMs

Question

I am looking for a document that suggests coding practices and rules that should be followed in User Exits and VOFMs in SAP R/3. Like value the variable XKWERT with the desired value in Pricing Condition Formula VOFMs, or never read an SAP defined internal table into the header line. Things like that. Does any one know of such a document?

Answer 1

Hi, this may help you.
User exits (Function module exits) are exits developed by SAP. The exit is implementerd as a call to a function module. The code for the function module is written by the developer. You are not writing the code directly in the function module, but in the include that is implemented in the function module.
The naming standard of function modules for functionmodule exits is:
EXIT_<program name><3 digit suffix>
The call to a functionmodule exit is implemented as:
CALL CUSTOMER.-FUNCTION <3 digit suffix>
To find a Exit.
Goto Transaction -- Find The Package
SMOD >f4>Use the Package here to Find the Exits In the Package.
Else if you Want to search by Application Area wise ,
There is one more tab to find the Exits in the Respective Application Area.
Implementing the Exit-- CMOD Create ProjectsAssgn your Component .
Now Run ur Transaction to Check if it Triggers.
Thats it..
Suppose you need to find out all the user exits related to a tcode.
1. Execute the Tcode.
2. Open the SAP program.
3. Get the Development Class.
4. Execute Tcode SE84.
5. Open the Node 'Envir. -> Exit Techniques -> 'Customer Exits -> Enhancements'
6. Enter the Development class and execute.
Check out this thread..
The specified item was not found.
1. Type the transaction : system->status-> <PROG. NAME>
2 open SE37 , type EXIT<PROG NAME> and press F4 to get the list of function exits available.
3. Open CMOD utilities->SAP enhancements
EDIT->All selections
4.type the function module name obtained in step 2, in fields 'component name' in 'additional selections' block. and execute.
5. The displayed list contains the enhancements names for the transaction You were looking for.
6. Create a project in CMOD and the code in default include->activate.
http://www.erpgenie.com/sap/abap/code/abap26.htm
which gives the list of exits for a tcode
http://help.sap.com/saphelp_nw04/helpdata/en/bf/ec079f5db911d295ae0000e82de14a/frameset.htm
For information on Exits, check these links
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sapgenie.com/abap/code/abap26.htm
http://www.sap-img.com/abap/what-is-user-exits.htm
http://wiki.ittoolbox.com/index.php/HOWTO:Implement_a_screen_exit_to_a_standard_SAP_transaction
http://www.easymarketplace.de/userexit.php
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sappoint.com/abap/userexit.pdfUser-Exit
http://www.planetsap.com/userexit_main_page.htm
User-Exits
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sap-img.com/ab038.htm
http://www.planetsap.com/userexit_main_page.htm
http://www.sap-basis-abap.com/sapab013.htm
http://sap.ittoolbox.com/documents/popular-q-and-a/user-exits-for-the-transaction-code-migo-3283
These links will help you to learn more on user exits.
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c8/1975cc43b111d1896f0000e8322d00/frameset.htm
http://www.planetsap.com/userexit_main_page.htm
http://www.allsaplinks.com/user_exit.html
www.sap-img.com/abap/what-is-user-exits.htm
Also please check these threads for more details about user exits.
Re: Screen exit
user exit and customer exit
user exit
1. Document on UserExits in FI/CO
http://www.ficoexpertonline.com/downloads/User%20ExitsWPedit.doc
2. Finding User Exits...
http://sap.ionelburlacu.ro/abap/sap2/Other_Useful_Tips.html#Finding_User_Exits
3. List of all User Exits...
http://www.planetsap.com/userexit_main_page.htm
VOFM is the transaction where you can maintain Requirement routines, which are assigned through cusomization.
To create a routine you need access key & routine no. starts with "9".for ex. 901,902 etc.
one important thing to note that even if you have some syntax errors inside your routine, it will get activated without errors. So, you need to do Main Program check before activation.
Refer to SAP Note no : 327220,381348,156230.
goto VOFM tcode for wrting the Routines
from menu Requirements-> pricing
You can create the pricing related routines here
Use the Number from 900 only
take the acess key and try to copy the existing routine and change the code to your requirement  and keep a break point and see
Activate it before execution
Reward If Helpfull.
Regards Madhu.