Hi,

It appears you've observed changes in Odoo 19 regarding order reference naming conventions and the assignment of journals to payment methods. For order references, Odoo 19 defaults to a sequence format like INV/year/incrementing-number, which resets annually. If your previous Odoo version used a continuous sequence, this update would align your system with the new default, causing the counter to restart from zero each year. Odoo also logs changes to reference numbers in the chatter, and you have the flexibility to customize the sequence format and its periodicity if needed.

Regarding the reassignment of journals to payment methods, Odoo 19 does introduce "Automatic creation of payment providers" to streamline online payment setup. However, the documentation doesn't explicitly state that existing journals would be reassigned to payment methods during an update. Payment methods are typically configured within the "Incoming Payments" and "Outgoing Payments" tabs of a bank or cash journal. While new payment providers might be automatically configured, any unexpected reassignments of existing journals would warrant a review of your journal and payment method configurations in Odoo 19 to ensure they are set up as intended.