Deep Dive: Technical Architecture

This module introduces advanced financial governance by safely overriding the core button_confirm method of the purchase.order model. It injects new computed fields (needs_approval, is_approved) that dynamically evaluate the amount_total threshold against business rules. Security is strictly enforced at the ORM backend level: the custom action_manager_approve method explicitly verifies the self.env.user against the purchase.group_purchase_manager XML ID. If an unauthorized user attempts to bypass the UI via RPC calls or API scripts, the ORM will raise a UserError. Additionally, all state changes are permanently audited into the chatter using message_post, ensuring total traceability.