Some feature tabs listed on the menu bar are not affected by security settings. For example, even if you uncheck all the options for Purchasing, the Purchase tab still appears on the menu bar so you may access:
-- Items On Order
-- Process Other Returns
-- RMA Reports: Items In Transit
Another example is if you uncheck all the options for Accounting, the Accounting tab still appears on the menu bar and you still have access to:
-- Cost Verifier
-- Voids: Pending