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from this case error message, we checked the optical cross connection in NE10318,the optical cross connect for the channel is already created in NE 10318:
To confirm the data in U2000 is consistent with the data in NE, make a NE upload(Configuration->NE Configuration Data Management) and OCH trail search(Service->WDM trail->Search for WDM Trail), after that check the optical cross connect again in NE 10318:
the optical cross connection still there, but there are no Trail Name for these optical cross connect, so these optical cross connect not used by any OCH trail, for double-confirmation, make a WDM trails browse on the WSM9 card:
there are no OCH trail for the channel, so the optical cross connect can be deactived and deleted, after that OCH trail creation can be tried again.