Hi,

In Odoo MRP (Manufacturing), work order statuses follow a strict forward-moving flow: Ready → In Progress → Done. Once a work order is marked as "Done", it is considered completed, and by default, you cannot revert it back to "In Progress" or any earlier state through the user interface. This restriction is intentional to preserve traceability and accuracy in production records. However, if you accidentally marked a work order as "Done" and need to reverse it, your only option in Odoo Online (SaaS) is to cancel the entire manufacturing order and recreate it, since direct status reversal is not allowed and custom actions or SQL fixes are not possible. If you're using Odoo.sh or Community, a developer can technically reset the state via the backend (e.g., with a custom server action or by updating the state field), but this should be done carefully to avoid data inconsistencies.

Hope it helps.