Year end change in Financial modules

We are moving our year-end, which will mean going from period 06/04 to 07/01.  

I'd planned to do this by running each period end in turn for 06, then doing a 
year-end, but I'm not entirely sure how to fiddle the GL calendar file to suit. 
  Another thought I had was to set the GL company profile to 4 periods, run the 
year end then set it back to 12 periods.  Has anyone ever tried this, does it 
impact history at all?

Thanks in advance,

Neil.


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