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- Customer ID or Call Number(s) is/are not of numerical value.
- Message: "<error> is not a valid integer value."
Handling: The Librarian is returned to the Transaction Menu.
- The given Customer ID or Call Number does not exist.
- Message: "Customer not found" OR "Book Copy not found."
Handling: An error message is shown, and the Librarian is
returned to the Transaction Menu.
- The Book Copy with the given Call Number is loaned out to
another Customer.
- Message: "Book Copy is on loan."
Handling: An error message is shown, and after pressing "OK"
the Librarian is returned to the Transaction Menu.
- The Book Copy with given Call Number is on hold with another
Customer.
- Message: "Book Copy is on hold."
Handling: An error message is shown, and after pressing "OK"
the Librarian is returned to the Transaction Menu.
- The Customer's Fines exceed their maximum amount allowed.
- Message : "Customer is restricted."
Handling: An error message is shown, and after pressing "OK"
the Librarian is returned to the Transaction Menu.
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