How to set a default value for particular field in SRM PO Portal

Dear Gurus,
Im desparetly need a help in web dynpro on how to set a default value for a field(flag) in PO header tab in portal.
My requirement is whenever the user press the edit button in PO screen,automatically a flag field should be set as abap_false.
I dont think this will handle in check badi or change badi. i tried this part in onbuttonpressed overwriteexit in CNR_VIEW views,i can get the function EDIT in debugging mode,but dont know how to proceed further.....
Many of them suggested to go with get attribute and set attribute for changing any particular field in web dynpro,but im not very familiar in using those get and set attributes.I request you people can give me sample code on how to identify my target field in the node and set the values while pressing EDIT Button.
Thanks in advance...
Regards,
Sathish

Dear Laurent,
Thanks for your response,
But i searched in enhancement spot of WD_BADI, but couldnt get the exact way to change the coding,
My real requirement is, that particular flag should be enable and disable dynamically by checking a condition in my header values.So in that case i dont know how to proceed further to handle in the PO screen.
Kinly guide me how to get the particular node of field in the Purchase order screen.
Thanks you in advance,
Sorry for the inconvenience if any
Regards,
sathish

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Hello,
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"myname1", "attribname1"
"myname2", "attribname2"
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my_name char(30),
vc_attributeName "decode(:vc_attributeName,null, 'none', :vc_attributeName)"
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{code}
Control File:   my_data.ctl
Data File:      mydata.dat
Bad File:     mydata.bad
Discard File: none specified
(Allow all discards)
Number to load: ALL
Number to skip: 0
Errors allowed: 50
Bind array:     64 rows, maximum of 256000 bytes
Continuation:    none specified
Path used:      Conventional
Table MY_DATA, loaded from every logical record.
Insert option in effect for this table: INSERT
TRAILING NULLCOLS option in effect
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MY_NAME                             FIRST    30   , O(") CHARACTER
VC_ATTRIBUTENAME                     NEXT     *   , O(") CHARACTER
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Table MY_DATA:
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0 Rows not loaded due to data errors.
0 Rows not loaded because all WHEN clauses were failed.
0 Rows not loaded because all fields were null.
Space allocated for bind array:                  18560 bytes(64 rows)
Read   buffer bytes: 1048576
Total logical records skipped:          0
Total logical records read:             4
Total logical records rejected:         0
Total logical records discarded:        0
Run began on Mon Feb 09 18:17:35 2009
Run ended on Mon Feb 09 18:17:36 2009
Elapsed time was:     00:00:00.98
CPU time was:         00:00:00.10
{code}
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How to set a default value for particular field in SRM PO Portal

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