Il would be useful if the "Cancelled requests" and "Completed requests" of articles request were kept in different tabs, just like it exists for acquisition suggestions.
I don't think it is important if there are separate tabs. I'd be happy to display the history on one tab, provided the Status is displayed. In the staff client at /moremember.pl I'd suggest inserting the Article Requests History tab below the Reserves History tab and in the OPAC at /opac-user.pl, below the Your Reading History tab. Display of article request history in the staff client could follow the 'intranetReadingHistory' system preference. The fields to be displayed would be: Date Title Branch Barcode Volume Issue Chapter Pages Status