Product cancellation/modification workflow

Hello,

I'am stuck on a setting up a profile cancellation workflow.

Actually for an approval workflow I used v_uid_personwantsorg ID in order to identify this new approval request,and so the Manager in PersonWantsOrg table, like this:

select UID_PersonInserted

from PersonWantsOrg

where UID_PersonWantsOrg = 'v_uid_personwantsorg'

The problem is that this method doesn't work with Cancellation/Modification cases, as there are no new PersonWantsOrg object created.

So my question is, how can I identity the needed PWO object in order to manage cancellation/modification case?

Regards,

Anton