Account Move Tier Validation Approver

This module adds an "Approver of Vendor Bills" field on the vendor (partner) form, right after the supplier payment terms. When you create a vendor bill for that vendor, the bill automatically picks up that person as the "Responsible for Approval". You can still change the approver manually on the bill, and the field is locked once the bill is under review.

In Accounting settings, under Vendor Bills, a new option "Require Approver In Vendor Bills" can be enabled per company. When it is on, Odoo creates (or reactivates) a tier definition for vendor bills that uses the approver field, so the chosen person becomes the reviewer. If you try to post a vendor bill without an approver while this option is active, Odoo blocks the posting with an error message.

The approver is also available as a filter/grouping field in the vendor bill list view, so you can search bills by responsible approver. The module touches account.move, res.partner, res.company and res.config.settings, and it also allows the "made_sequence_gap" exception when checking bills under validation.