For what reference did you mention here ! What kind of upgrade did you try to do. Software/ hardware related / what OS/ environment is there. Please reveal more if possible.
If there are any major issues they should be listed in the accompanying upgrade documentation from IBM. I do not remember any issues during our upgrade a ways back. It's not as bad as when you upgraded from a S/38 to an AS/400 and they changed command names.
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They are probably referring to Memo to Users for V7R1. Google and you should find the PDF. V6R1 to V7R1 should be fairly straitforward