bemade_multiple_billing_contacts: Initial commit.

__manifest__.py

@@ -27,7 +27,7 @@
     'author': 'Bemade Inc.',
     'website': 'https://www.bemade.org',
     'license': 'OPL-1',
-    'depends': [],
+    'depends': ['sale', 'account'],
     'data': [],
     'demo': [],
     'installable': True,

models/res_partner.py

@@ -0,0 +1,16 @@
+from odoo import models, fields, api, _, Command
+
+
+class Partner(models.Model):
+    _inherit = 'res.partner'
+
+    def _billing_contacts_domain(self):
+        self.ensure_one()
+        return [('is_company', '=', False), ('root_ancestor', '=', self.root_ancestor)]
+    billing_contacts = fields.Many2many(string='Default Billing Contacts',
+                                        comodel_name='res.partner',
+                                        relation='res_partner_billing_contact_rel',
+                                        column1='billing_contact_id',
+                                        column2='billed_partner_id',
+                                        domain=_billing_contacts_domain,
+                                        tracking=True)

models/sale_order.py

@@ -0,0 +1,6 @@
+from odoo import models, fields, api, _, Command
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+