Users who have not returned overdue books should not be able to reserve new books.
Acceptance Criteria:
Check user's current loans for overdue status before allowing reservation
Block reservation creation if user has overdue books
Provide clear error message indicating user must return overdue books first
Consider implementing grace period or configurable policy
Users who have not returned overdue books should not be able to reserve new books.
Acceptance Criteria:
Check user's current loans for overdue status before allowing reservation
Block reservation creation if user has overdue books
Provide clear error message indicating user must return overdue books first
Consider implementing grace period or configurable policy