Pretty sure if you want to use the DB options/agents using a mix of 7.1 master with 6.5.6 client is not such a good idea. I would get your oracle server onto 7.1 at the same patch level as the master.
I've automated a bparchive on a client from the master server. In your Archive policy create a backup schedule as a normal backup, this becomes a 'dummy'. Then on the client use the bpstart_notify with the policy and schedule just created. Within tha...