Hi,

To load fields in the Odoo 16 Point of Sale (POS) module, you can use the 'fields_get' method of the 'models' class. This method returns a dictionary containing information about all the fields of a model, including their type, string label, and whether or not they are required.

Here is an example of how you can use the 'fields_get' method to load fields in the POS module:

from odoo import models

class PosSession(models.Model):
    _inherit = 'pos.session'

    fields_get(self, allfields=None, attributes=None):
        fields = super().fields_get(allfields=allfields, attributes=attributes)
        # add additional fields here
        return fields

Regards