Sometimes ISBN10 comes before ISBN13 in Marc records, sometimes ISBN13comes before ISBN10 I made a Marc modification template to swap the erroneous ISBNs to get them in a consistent order, it just stated "Move 1st field 020 to 020" It worked as long as we had Koha 23.05.04, but after upgrade to 23.05.16 records are left unchenged I have also found this bug in an installation of Koha 24.05.05