Discovering same SIDs on 2 boxes in OEM

Using OEM v2.2, how can one differentiate between two databases with the same SID on two different boxes using "Discover node"?

I have a production DB in v7.3.5 that I need to test both the conversion and the app, so the SID is the same on each box, but the ONAMES alias is
(obviously) different. The production has already been discovered, but the
test one will not discover, I think due to the SID being the same.

Is this doable? I would RTFM, but I can't find a decent M to FR RE:OEM. :)

TIA,

Rich Jesse                          System/Database Administrator
Rich.Jesse_at_qtiworld.com             Quad/Tech International, Sussex, WI USA

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