Description of problem: The Red Hat Account Number from the imported manifest is not exposed on the 'upstreamConsumer' attribute of an Owner. This would be a nice enhancement as the current way to get this information from the Satellite/Katello side is to use the subscriptions API and pull the account number from one of the entries. It's a roundabout way to do it and it can be slow if there are a lot of subscriptions.
The code that's affected by this sub-optimal querying is low use and not a performance critical area like manifest refresh etc; closing this RFE.