Hello Koha 21.05.02.003 with UNIMARC I hawe problems with item inventory number. First problem with log error. Log intranet-error.log increased to 500 mb and it is growing. [Tue Mar 01 13:04:29.393965 2022] [cgi:error] [pid 1885507] [client 198.x.x.x:x] AH01215: Use of uninitialized value $subfield in string eq at /usr/share/koha/intranet/cgi-bin/cataloguing/additem.pl line 905.: /usr/share/koha/intranet/cgi-bin/cataloguing/additem.pl, referer: http://xxx-intra.xxx.lt/cgi-bin/koha/cataloguing/additem.pl?biblionumber=191... [Tue Mar 01 13:04:29.394068 2022] [cgi:error] [pid 1885507] [client 198.x.x.x:x] AH01215: Use of uninitialized value $subfield in string eq at /usr/share/koha/intranet/cgi-bin/cataloguing/additem.pl line 905.: /usr/share/koha/intranet/cgi-bin/cataloguing/additem.pl, referer: http://xxx-intra.xxx.lt/cgi-bin/koha/cataloguing/additem.pl?biblionumber=191... Do you know how to solve this problem? I think this problem arose when we tried add Item with Inventory Number. When I try to write a line in Item Inventory number and add item with Inventory number i get an error 500. Without inventory number item adds normal. Maybe it's a problem with mapping? Other error in MARC bibliographic framework test: The biblio.biblionumber and biblioitems.biblioitemnumber fields be mapped to a MARC subfield, Maybe you have encountered this problem and can help? Thanks for the help