First, I think the you probably do not want to report using the Position Hierarchy, you just want to report on Positions in more than one Business Group (and by definition therefore in more than one Position Hierarchy) - is that correct?
Second assumption here is that you want to report on Work Structures stuff, not on People data - i.e. unsecured data?
If all this is true, you should be able to do it as you say. If you need to show secured data (Post holders) then you need to make sure that the Security Profile allows that (the Security Profile must be created using the Global version fo the form, not the in BG one).
Any more info...?
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Geoff
Expressing opinions since 1962