from odoo import models class Partner(models.Model): _inherit = "res.partner" def read(self, fields=None, load="_classic_read"): res = super(Partner, self).read(fields=fields, load=load) if fields and "message_ids" in fields: for vals in res: partner = self.browse(vals["id"]) if not partner.is_company: continue domain = [ ("model", "=", "res.partner"), ("res_id", "in", [partner.id] + partner.child_ids.ids), ] vals["message_ids"] = self.env["mail.message"].search(domain).ids return res