I have recently added the production node to the OEM. When i refresh the nodes or discover them I get the 2 two databases but not the third one?

Also when i try to add manually the manual option is not enabled in discover nodes. Is there any work around to add the database to oem?

OMS repository is set in windows and agents and listener were restarted after adding the nodes, still having the problem.

Production database at Sun server A has 3 databases. Here i started the agents several times still the problem exists.