Hi,

In Odoo, the approval process for vendor payments works correctly when processing a single bill, but it’s skipped when paying multiple bills at once. This happens because the batch payment wizard (account.payment.register) directly creates and posts payments without triggering any approval workflow. As a result, the system processes batch payments immediately, bypassing the approval state or rules applied to individual payments.

To fix this, the approval step must be integrated into the batch payment creation flow. This can be achieved by overriding the action_create_payments() method in the account.payment.register model. The override ensures that payments created in bulk remain in the draft or to_approve state instead of being automatically posted. Additional logic can then set the payment’s approval state, record the requesting user, and optionally trigger a notification to the approver.

Next, you can extend the account.payment model with approval states such as “To Approve,” “Approved,” and “Rejected,” and add buttons in the form view for approvers to take action. When the payment is approved, it moves to the posted state. Access control rules can also be applied to ensure that only authorized users can post payments after approval.

In Odoo Enterprise, this process can be linked with the built-in Approvals app for a more integrated workflow, but even then, customizing the payment creation logic remains necessary to prevent automatic posting of batch payments.

Hope it helps