ROQL Inner Join

Topic by Justin

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I am attempting to inner join from a custom object to the contact table and am getting an error "too many source tables in query".  

I am able to get all of the data I need using the joining field (SELECT CO$Purchase$ContactID.ID FROM Contact), but quite frankly it is overkill.  I don't need 99% of the data returned in these queries.  Is there a configuration setting, or something that can be changed/updated by Oracle to allow me to inner join properly with a tabular query?

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