Hi Have upgraded my Koha on Ubuntu 16.04 to version 17.11.02.000. The Koha system is using 10.0.33-MariaDB. Have applied the fix on https://wiki.koha-community.org/wiki/DBMS_auto_increment_fix by adding to /etc/mysql/my.cnf and creating the corresponding file init-file=/var/lib/mysql/init-file_sidecode.sql New check outs are checked in with no issues. However, when checking in items that were checked out before the upgrade, I am getting the error: " The item has not been checked in due to a configuration issue in your system. You must ask an administrator to take a look at the about page <http://192.168.100.7:8080/cgi-bin/koha/about.pl#sysinfo> and search for the "data problems" section" The about page has this warning Warning You are missing the <template_cache_dir> entry in your koha-conf.xml file. That will bring a performance boost to enable it. The issue is only arising if I check in items checked out before the upgrade. Items checked out after the upgrade are not giving problems. Not sure if I have added the fix to the correct file in /etc/mysql/ when using MariaDB Kind Regards, Admire Mutsikiwa (Mr) ICT Manager Libraries University of Zimbabwe Tel:+263-4-303276 Mob:+263771117777 "It is easy to dodge our responsibilities, but we cannot dodge the consequences of dodging our responsibilities." Josiah Charles Stamp <http://www.goodreads.com/author/show/4867406.Josiah_Charles_Stamp>