Hi In our library we are migrating from our current system to Koha 21.11. We have migrated existing authority data and created for example Title data record * MARC 100$9 STA101744 * MARC 100$a Lansky, Ralph Authority data record (PERSO_NAME) * MARC 001 STA101744 * MARC 100$a Lansky, Ralph Both kinds of records were successully loaded, after that we tried to link these records using script "link_bibs_to_authorities.pl" but it failed. We expected this would create a link between title record and authority record via number STA101744 but instead the content of MARC 001 of the authority record was surprisingly replaced by a new number and it linked only to one title record that didn't have content in MARC 100$9 but did contain (another) "Lansky, Ralph" in MARC 100$a. While the actual records containing MARC 100$9 STA101744 were not linked to the authority record and seem to have been ignored. How can we successfully link title data records via existing numbers in MARC 001 of the authority record? Best wishes: Michael -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch