4.7 upgrade - SU25 in each environment?

Question: We're upgrading from 4.0 to 4.7. We've upgrade our Dev system and run the SU25 transaction to convert profiles to roles, now Dev is all sorted - do we need to run this in QA and eventually Prod systems as well before we transport anything up? or is it enough that we've done in Dev once?
Would really appreciate some help.
thanks

Answer:
We're upgrading from 4.0 to 4.7. We've upgrade our Dev system and run the SU25 transaction to convert profiles to roles, now Dev is all sorted - do we need to run this in QA and eventually Prod systems as well before we transport anything up? or is it enough that we've done in Dev once?
Would really appreciate some help.
thanks

I did it once in DEV, then maintained all the activity groups (make sure there are no OPEN FIELDS), then I do a mass transport downstream.
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