​I am working on an app where I need to set a default pricelist, based on whether the res.partner (Contact) is an individual or a company. This needs to be a field in the settings tab, so that the user can select which pricelist to use for company and which one for individuals. I managed to get this field to show up with this model:
class ResConfigSettings(models.TransientModel):
_inherit = 'res.config.settings'

​ default_pricelist_company = fields.Many2one(
        ​ ​'product.pricelist',
        ​ ​string="Default Pricelist for Companies",
        ​ ​default_model='res.partner',
        ​ ​config_parameter='my_addon.default_pricelist_company'
​) 
default_pricelist_individual = fields.Many2one(
        ​ ​'product.pricelist',
        ​ string="Default Pricelist for Individuals",
        ​ ​default_model='res.partner',
        ​ config_parameter='my_addon.default_pricelist_individual' 
​)

However, this causes an error on save, that the field res.partner.pricelist_company does not exist.
I am relatively new to odoo so I am not sure exactly what i am doing wrong or how to properly set up these settings. Any help, or explanation of what i am doing wrong is highly appreciated, thanks!