About controlling transactions in oracle forms

I've read in many articles that it is recommended to use Forms default processing for transactions. However I woud like to know if is it possible to take control over the transaction process. I'm working with record groups created dinamically , and I'm trying to insert those values in different tables but I need to control the whole transaction, I mean , if something goes wrong do a rollback , if not make a commit. Can anyone help me. How can i accomplish this task?
Thanks

They don't want to "tie" the application's functionality to the database serverThey sound like idiots. Might as well go fishing, ...but leave the fishing pole at home.
But for starters:
Forms operations are done in the following triggers:
selects data in the on-select trigger.
populates the data display block in on-fetch
deletes in on-delete
updates in on-update
inserts in on-insert

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