Hi We are working on Debian GNU/Linux 10 with MariaDB 10.3.38 and Koha 21.11.09. Since about September 2022 after the update from Koha 18.11 to 21.11 we see auto_increment problems with tables "reserves" and "old_reserves" (but NOT with any of the other tables): The following ids exist in both tables reserves and old_reserves: 372 In fact every single hold evokes the problem. Deleting the id manually from table "old_reserves" does always solve the problem: DELETE FROM old_reserves WHERE reserve_id IN (372); According to https://wiki.koha-community.org/wiki/DBMS_auto_increment_fix the auto_increment problem should not occur at all after Koha 17.05. What could be the reason for this behavior? 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