Adding a Z Field onto an SAP Std Screen

Question

Hello Experts,
I need to add my own Z field onto an SAP Std screen. The Z field already exist in the Append stucture of the table VBAK.
How to do this? Will it come under a screen exit or field exit?
May i know if i need to go for screen programming such as loop at screen..endloop. etc.
Please explain in Tech terms(code) wih an example.
Appreciate your response with points.
Thanks
Dan

Answer 1

Hi
1) Here you need only to design the dynpro using the structeu VBAK and the system'll automatically store them in VBAK table.
Could you please tell me the dynpr prog involved?
Use trx SE80:
- choose program option and insert 'SAPMV45A';
- Press display and open SCREEN node;
- Search screen 8309, do a doubleclick and press MODIFY: now you're in screen painter.
- To insert the input/output fields use the structure VBAK: in this way the headerline of VBAK'll automatically be filled. You need only to insert the code in screen flow (PBO and/or PAI) if you need to insert some controls;
2) U should consider all saving are made in update task, so it should be better you create a z-function to update your z-table and call that fm in update tusk into USEREXIT_SAVE_DOCUMENT
What is the code to do the above. Pls explian.
If you see the user-exit USEREXIT_SAVE_DOCUMENT you can see a example:
FORM USEREXIT_SAVE_DOCUMENT.
* Example:
* CALL FUNCTION 'ZZ_EXAMPLE'
*      IN UPDATE TASK
*      EXPORTING
*           ZZTAB = ZZTAB.
ENDFORM.                    "USEREXIT_SAVE_DOCUMENT
So you have to create a your function module with importing parameters structurated like your Z-table, in this way you can transfer the record you need to update/insert. In the fm you insert all code you need to do the updating/inserting:
FUNCTION 'ZZ_EXAMPLE'.
  MODIFY ZZTAB FROM ZZTAB.
ENDFUNCTION.
Max