https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=29438 Lucas Gass <lucas@bywatersolutions.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |lucas@bywatersolutions.com --- Comment #1 from Lucas Gass <lucas@bywatersolutions.com> --- Any ISBN prefixed with 979 cannot be converted to an ISBN10. An 979 ISBN will also not pass the check here: if ( $isbn && $isbn->is_valid() ) For example: use Business::ISBN; my $isbn = Business::ISBN->new(9798986969305); warn Data::Dumper::Dumper($isbn->is_valid); this returns an empty string for $isbn->is_valid -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.