I moved an article from my blog to my hub. I deleted it from the blog. I received a message that said that it was duplicate content, probably due to the timing of when Google read the articles, since i made sure it was on the hub properly, before deleting it. I just waited a couple of days for the next sweep, and the duplicate content message was gone. I am planning to move my articles one at a time, to avoid having too many duplicate content messages. Alternatively, I guess I could delete them, wait a couple of days, and then post them to hp.