Hi Marco, this process is explained in the documentation link that Luke provided. Per my question, the category tag is the key here.
I expect that if you're seeing an unexpected category tag, then you've probably got multiple definitions of the account in question, one with and one without category="default".
Lastly, I would be remiss not to note that this system has been improved in the new ES 3.0; mind you, there is no fix for GIGO, so a misplaced category would still produce the unwanted result.
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