I would appreciate some assistance with biblionumber and biblioitemnumber, given that we can no longer enter new biblios. Error code is : "Tag "" is not a valid tag. at /usr/share/koha/lib/C4/Biblio.pm line 2848" That line (under the head : "Internal function to add or update biblionumber and biblioitemnumber to the MARC XML" is the first of these four: my $new_field = MARC::Field->new( $biblio_tag, '', '', "$biblio_subfield" => $biblionumber, "$biblioitem_subfield" => $biblioitemnumber What are the values that biblio.pm is expecting, and where exactly are they input from GUI page <http://koha-admin/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=AB&breedingid=38301#> ? It seems that the call is based upon biblionumber=0 [which is <10, therefore creating the error according line 2847 : "# biblionumber & biblioitemnumber are in the same field (can't be <10 as fields <10 have only 1 value)"] and seeing as we are using a custom framework (cut down to what we need for cataloguing staff purposes), I need to know what particular line I have set to "ignore" that is creating the error. What "Tag" have I left out? Can't find anything in the docs on this "Internal function." Thanks for any pointers, Paul tired old sys-admin. --- Archives and Collections (ACS) Society