Hi all, 

I manage to get Invoice payments to work in Odoo 18 as it was in Odoo 17.

As Ray said, you need to do some additional work and the official Odoo 18 documentation is not yet revised. 

This is what I did:

1. Go to: Accounting -> Configuration -> Chart of Accounts

2. Create two new accounts : "Outstanding Receipts" and "Outstanding Payments". Type: Current Assets. Allow Reconciliation: Yes. I used codes: 120003 and 120004.

3. Go to: Accounting -> Configuration -> Journals

4. Open Journal you want to use the intermediate "Outstanding" account. Here I choose CASH.

5. Click the Incoming Payments tab and choose our new 120003 Outstanding Receipts account in Outstanding Receipts accounts column.

6. Click the Outgoing Payments tab and choose our new 120004 Outstanding Payments account in Outstanding Receipts accounts column.

Done.

Now if you click the PAY button in the invoice view, the payment will be created in the Journal and automatically reconciled with the invoice.

These Outstanding accounts must then be reconciled with the actual bank entries to mark the invoice as PAID, which is a standard and familiar procedure.

You must repeat this process for each payment method (Journal) required: Card, Cash, Bank, Stripe, etc. You may use the same 120003 / 120004 Outstanding accounts or create a new pair for each payment (Journal).

I hope this will help you until the Odoo documentation is updated.

Best regards,

Radoslaw Ziegler