If `AllowMultipleIssuesOnABiblio` is enabled patrons can checkout multiple items from same record but these check outs were not checked by Koha. This patch changes `CheckPrevCheckout` system preference functionality so that it also checks patrons current check outs and displays new confirmation message "Patron has this title currently checked out:..." so that librarians now have to confirm if item will be check out to patron.
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