Hi, The bug 599 has been understood... It's due to inconsistencies in Koha features : in MARC you can put barcode "mandatory" or "not mandatory". BUT in non-MARC part of Koha, barcode IS MANDATORY. If you set barcode = non mandatory in MARC parameters, your DB is broken when you let barcode empty. The question is : what is the good behaviour ? * barcode IS mandatory => manage this in checker, the tools that checks that your DB is correctly parametered. * barcode IS NOT mandatory => change non-MARC part of Koha to accept empty barcodes. From a technical point of vue, both are simple. My question is for librarians (& for our big "circulator", i mean chris, if there is something i'm missing technically) NOTE : we agree that a books without barcode can't be issued/returned, aren't we ? -- Paul POULAIN Consultant indépendant en logiciels libres responsable francophone de koha (SIGB libre http://www.koha-fr.org)