[Koha] inconsistencies in acquisition.simple process

Hi all, I'm working on fitting the acquisition.simple process to the needs of the ESIEE library, and something is bugging me on the addbiblio.pl page. Why do pieces of information like place, number of pages or itemtype should appear here, on the bibliographic notice form, and not on the item form (the next page)? Because of that, we are obliged to create two different notices for the same bibliography if we want two items to be in different places. Worse, the fields concerning place and itemtype duplicate themselves strangely when a bibliography has several items. Can someone explain me the technical reasons of this "inconsistency", if it's one? thx /pierre