Hi, I am investigating in items table to see which data are used, useful and useless. I found that. Those information are meaningfull and useful : itemnumber biblionumber biblioitemnumber homebranch holdingbranch itemnotes location itemcallnumber itemlost notforloan timestamp reserves for reserve management dateaccessioned (boils down to creation date) If I understand correctly. The problem is that if MARC data is favoured, then we loose this value if not linked. wthdrawn is used in Circulation.pm to cancel an issue if set. renewals is used and updated in Circulation.pm. Maybe it could get into issues table. paidfor is used in FixAccountForLostAndReturned but usage is rather cryptic restricted (I cannot tell the difference with notforloan ?) itype ??? Those fields I propose to drop : binding (unknown use) onloan,issue_date are Already in issues + unknown use. issues (can be calculated from issues table) price,replacementprice (used in Overdues only for selection),replacementpricedate,booksellerid are account values which seem never to be used.