[18.0][BUG] account_operating_unit: payment register wizard shows journals from wrong OU

[IJOL]

Module

account_operating_unit

Describe the bug

When registering a payment from the invoice form, the payment wizard (account.payment.register) does not filter available journals by the invoice's operating unit.

Steps to reproduce

1. Configure two operating units (OU_A, OU_B) with separate bank/cash journals
2. Create a user with access to only OU_B
3. Create and post a vendor bill assigned to OU_B
4. Click Register Payment on the bill

Current behavior

• The journal dropdown shows journals from all OUs (including OU_A)

• The default journal may be from OU_A

• Clicking "Create Payment" raises AccessError:

  COMPANY (id=X) does not have 'read' access to: Journal (account.journal)

  Because the ir.rule "Journals from allowed operating units" blocks access to OU_A journals for the OU_B user.

Expected behavior

• Only journals matching the invoice's OU (or with no OU) should appear in the dropdown
• The default journal should be from the invoice's OU
• Payment creation should succeed without AccessError

Root cause

account.payment.register._get_batch_available_journals() (core Odoo) searches journals filtered by company and type, but account_operating_unit does not extend this method to add OU filtering. The ir.rule filters by the user's OUs, but when a user has access to multiple OUs, journals from all their OUs appear — even when paying an invoice from a specific OU.

Affected versions

• 18.0 (confirmed)
• Likely affects 16.0 and 17.0 as well