[Koha-bugs] [Bug 41060] Add a value_builder to check if ISSN is valid

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=41060 --- Comment #10 from David Nind <david@davidnind.com> --- Just adding this link about ISSNs and their format: https://www.issn.org/understanding-the-issn/what-is-an-issn/ -- You are receiving this mail because: You are watching all bug changes.