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Q: What happens if 'Items aged to lost after overdue interval' is not defined?
A: In this case the feature is turned off for the loan.
Q: What happens if multiple instances of the jobs overlap?
A: If these two jobs updates same loan than the loan will be updated twice. But if the fee assign job overlaps, and they process the same loan, than fee/fines will be assigned twice. But it is possible to cancel the fees using UI.