The Microsoft Dynamics AX GFM team have written up a great seven part series about dimension defaulting. Read it here: http://blogs.msdn.com/b/ax_gfm_framework_team_blog/archive/2014/09/12/dimension-defaulting-part-1-financial-dimensions-discovery.aspx
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This would really have been helpful information to get when this new framework was released, but better later than never I guess.