[ADD] compute vendeur onchange du client sur account_move

models/account.py

 # Copyright 2021- Le Filament (https://le-filament.com)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
-from odoo import fields, models
+from odoo import api, fields, models
 
 
 class AccountInvoice(models.Model):
@@ -33,6 +33,10 @@ class AccountInvoice(models.Model):
     # ------------------------------------------------------
     # Computed fields / Search Fields
     # ------------------------------------------------------
+    @api.onchange("partner_id")
+    def _update_invoice_default_sale_person(self):
+        for move in self.filtered("partner_id"):
+            move.invoice_user_id = move.partner_id.user_id or self.env.user
 
     # ------------------------------------------------------
     # Onchange / Constraints