This enhancement allows checkouts of items already checked out to someone else when using SIP2. This is enabled using the new system preference AllowItemsOnLoanCheckoutSIP.
Example use case: Patron A has checked out a book and tried to return it, but for some reason it hasn't been properly checked in - but it was re-shelved anyway. Patron B wants to borrow this book from an unstaffed library, but the self-checkout blocks them because the book is still checked out to Patron A.
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