You're missing lots of eZ Publish basics here. For example, adding a User datatype attribute to a content class results in a new content user class. What would be the purpose of creating users that are articles a the same time? I see no logical sense in here. Users are users, and whenever they create new content (for example Articles), special reference (or meta data) is created by the system, it's the default feature.
I suggest going through the entire documentation, especially the basics and concepts part.
I would suggest you to use the <b>Object relations</b> datatype in your class. http://ez.no/doc/ez_publish/technical_manual/4_0/reference/datatypes/object_relations
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