Modify the selection screen for the transaction VF04

Question

Hi all,
My requirement is as follow . I need to modify the selection screen (1000) in such a way that I need to add three more fields to te existing selection screen and make some check boxes checked by default which are unchecked . I have found out all the exits in this development clas VF .  I am listing them out here .
J_3RSINV  Export Sales
SDVFX001  User exit header line in delivery to accounting          
SDVFX002  User exit for A/R line (transfer to accounting)          
SDVFX003  User exit: Cash clearing (transfer to accounting)        
SDVFX004  User exit: G/L line (transfer to accounting)             
SDVFX005  User exit: Reserves (transfer to accounting)             
SDVFX006  User exit: Tax line (transfer to accounting)             
SDVFX007  User exit: Billing plan during transfer to Accounting    
SDVFX008  User exit: Processing of transfer structures SD-FI       
SDVFX009  Billing doc. processing KIDONO (payment reference number)
SDVFX010  User exit item table for the customer lines              
SDVFX011  Userexit for the komkcv- and kompcv-structures           
V05I0001  User exits for billing index                             
V05N0001  User Exits for Printing Billing Docs. using POR Procedure
V60A0001  Customer functions in the billing document               
V60P0001  Data provision for additional fields for display in lists
V61A0001  Customer enhancement: Pricing          
Going with the descrition I dont see any of them suits my requirement .  But there should be an approach . Can anyone please help me to find out an exit or explain me how do we identify an exit to modify the selection screen of an standard ransaction .
Regards,
Varun .

Answer 1

Hello,
I would suggest you to go for BADI,
Follow the below steps to find out what all BADI's are called when you press any button in any transaction.
1) Goto se24 (Display class cl_exithandler)
2) Double click on the method GET_INSTANCE.
3) Put a break point at Line no.25 (CASE sy-subrc).
Now
4) Execute SAP standard transaction
5) Press the required button for which you need to write an exit logic, the execution will stop at the break point.
6) Check the values of variable 'exit_name', it will give you the BADI name called at that time.
7) This way you will find all the BADIs called on click of any button in any transaction.
Regs,
Venkat