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None (blank): A blank field means the user has no rights to view or approve expense reports, and can only view their own.

Team Approver: The user can only view and approve expense reports for their own specific team.

All Approver: The user can view and approve any expense report.

Administrator: The user can view and approve any expense report, as well as access the reporting and configuration menus in the Expenses app.

For more details: https://www.odoo.com/documentation/16.0/applications/finance/expenses.html