I have inherited res.partner and then added a method that will get the partner's property_account_receivable_id field:

@api.multi
def get_receivable_id(self):

    return self.sudo().property_account_receivable_id.id

In Odoo 10 (python 2.7), the method works correctly. However in Odoo 11 (python 3), the code returns the property_account_receivable_id of the admin (SUPERUSER). I know there's a lot of workarounds/solution for this but I just want to know why did this happen. Did something change in Odoo 11? Do they have some kind of changelog for us developers? Thank you very much in advance.