Purchase Fully Invoiced

Standard Odoo marks a purchase order as "Fully Billed" as soon as the bills exist, even if they are still in draft. This module adds a second, stricter status on the purchase order called "Posted Billing Status" (invoice_status_validated) that takes the state of the bills into account.

The new status has the same three values as the usual billing status: "Nothing to Bill", "Waiting Bills" and "Fully Billed". It is computed automatically from the standard billing status and the state of the linked bills. If the order is not yet fully billed, the new status simply follows the standard one. If the standard status says "Fully Billed" but at least one related bill is still in draft, the new status stays at "Waiting Bills" instead. Only when no draft bill remains does it show "Fully Billed".

On the purchase order form the field is added but kept hidden, so it is mainly used for searching and filtering. In the Purchase Orders search view, a new filter called "Bills Received and Validated" is available after the standard "Invoiced" filter. It lists purchase orders whose posted billing status is "Fully Billed", i.e. orders that are fully invoiced and whose bills have all been validated.

This helps purchasing and accounting users distinguish orders that are truly closed from those still waiting for draft bills to be posted.