Obvious Answer Man
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Article: UniBeast: Install OS X Mavericks on Any Supported Intel-based PC
So before you can update you need to log into the other MAS account and update it's software, then log out and into the original account and then update.
What this means is that you have software from the Mac App Store installed on your system that is tied to two different MAS accounts.After Install Mavericks updates error: Update Unavailable with This Apple ID,This update is for an app downloaded with a different Apple ID. Sign in with that Apple ID and try again. ...We could not complete your request..There was an error in the App Store. Please try again later. (null)
So before you can update you need to log into the other MAS account and update it's software, then log out and into the original account and then update.