What Does The Message "Maximum Level Of Overdues" Mean?

HIGHEST LEVEL OR MAXIMUM LEVEL OVERDUES (Circulation Coordinators Only)
This is the highest level of an overdue notice the patron can receive before being blocked. This is usually the third overdue notice. It can also be a billed book notice. A student must return the book before he or she can check out another book. A faculty or staff member can check out the book, but will need an override.

Other links that might help are …
Can I renew a billed book or item?
What items can I override?

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