Hallo everybody, please be kind and let me know, how to link a custom field from two tables/models, for example a new field from res.partner in sales.order
my case, I add a new field, family_name, in res.partner and then I want to call that field in sales.order. I did, many2one relationship in model sales.oder. but, it doesn't show the value.
Please show me how it works and wish you have a good Karma. Thanks In advance