Need to validate a existing field in the table maitainence Generator events

Hi EXPERTS,
There is one Z-table and for that TMG also there. There is custom transaction for sm30. Now I need to validate one field BNAME for new entries I have created event -05(creating new entry) it is validating correctly. But now another requirement is if user also wants to change the existing values for the field BNAME it should also be validated needs to populate error mesg and does not allow to save it. I used event 01(before saving data) 07 ( before correcting the contents of selected field) 18 ( after checking whether data has changed)but not working any of these events. Please suggest me which event is suitable for my requirement. Orelse I need to put the code in the flow logic of the screen under PAI module I think this is not a good practice.
Code:
FORM data_changed.
DATA     : l_bname TYPE xubname.
CONSTANTS: c_mesg      TYPE char16   VALUE 'Invalid SAP User',
             c_error     TYPE char1    VALUE 'E'.
* Validation on BNAME field
IF zps_capex_appr-bname IS NOT INITIAL.
    SELECT SINGLE bname FROM usr01 INTO l_bname
           WHERE bname = zps_capex_appr-bname.
    IF sy-subrc NE 0.
      MESSAGE c_mesg TYPE c_error.
    ENDIF.
ENDIF.
ENDFORM.                              "DATA_CHANGED
Please suggest me how to proceed.
<Added code tags>
<< Priority normalized >>
Awaiting for your replyu2026
Thanks in Advance.. 
Edited by: Rob Burbank on Mar 2, 2012 9:23 AM

Hello Sreekanth,
How are you populateing the field zps_capex_appr-bname ? I'm pretty much sure that this is not getting populated at runtime.(put a break-point & check)
In order to access the data in the TMG [Event01|http://help.sap.com/saphelp_nw04s/helpdata/en/91/ca9f0ba9d111d1a5690000e82deaaa/content.htm], we have to use the TMG system tables - TOTAL & EXTRACT.
If your validation of BNAME fails, remember to:
1. Set SY-SUBRC to a non-zero value,
2. Set the flag VIM_ABORT_SAVING to 'X'.
BR,
Suhas

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Message was edited by: max bianchi

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