This enhancement adds a new system preference ValidateISBN. When enabled, Koha will apply a valid checksum algorithm to ISBN fields (020$a for MARC21 and 010$a for UNIMARC) to validate the ISBN when cataloguing bibliographic records. The user will be prompted to fix their invalid ISBN, or have the option to bypass the ISBN check and save anyway. This will work for both 10-digit and 13-digit ISBNs.
This patch also cleans up some bad indentation in
cataloguing/addbiblio.pl.
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