This fixes an issue that prevented users from creating new employee appraisals. The appraisal process now works again after being aligned with a recent system change.

The override of `read()` in hr.appraisal was adapted to the changes introduced in #114024.

The Point of Sale customer and payment screens were adjusted to stay compatible with recent platform updates. This helps keep localized POS workflows, including Chilean and Mexican e-invoicing and due-settlement payments, working smoothly after the refactor.