Any way to execute a StoredProcedure as part of commitChanges() ?

I want to post-process after flushing my context to db, before db transaction commit, and, if SP fails rollback the context to the pre-commitChanges state (at least retain the persistence state, just like it happens when there is a db exception while flushing to the db).
If not posible, I'll appreciate any direction to hack the code.

Thanks.

Atte. Juan Manuel Díaz Lara