diff --git a/odex25_project/project_base/models/project_invoice.py b/odex25_project/project_base/models/project_invoice.py
index ed9f3ea50..9566d2d99 100644
--- a/odex25_project/project_base/models/project_invoice.py
+++ b/odex25_project/project_base/models/project_invoice.py
@@ -53,7 +53,7 @@ class ProjectInvoice(models.Model):
                                                  string="Allowed Internal Users", default=lambda self: self.env.user, domain=[('share', '=', False)])
     allowed_portal_user_ids = fields.Many2many('res.users', 'project_invoice_allowed_portal_users_rel', string="Allowed Portal Users", domain=[('share', '=', True)])
     
-    @api.onchange("project_invline_ids")
+    @api.onchange("project_invline_ids.project_invoice_id")
     def get_price_unit_value_test(self):
         for rec in self.project_invline_ids:
             rec.price_unit = rec.project_invoice_id.project_id.contract_value_untaxed