Dear all, as a non specialist in marc21 i am being asked how to fill field 240 properly. What i understood from what was explained to me today, is that when 240 refers to a uniform title that doesn't have a clearly defined and unique author, a uniform-title authority will be used, with the header in 130. But if the title has one unique and unambiguous author, a person for instance, a personal name authority should be used, with the title in 100$t. Seeing how authorities work in Koha this doesn't seem feasible, as the subfields will be copied from the specified header to the bibliographic record, and this would involve copying a 100$t to a 240$a while the 100$a of the authority is copied to the 100$a of the bibliographic record. Can anyone confirm this understanding of the marc21 standard and give me a better clue of how it is supposed to be implemented in Koha? Thanks, -- Gaetan Boisson Chef de projet bibliothécaire BibLibre 06 52 42 51 29 108 avenue Breteuil 13006 Marseille gaetan.boisson@biblibre.com