diff --git a/account_usability/account.py b/account_usability/account.py
index 8ebf142..61e0143 100644
--- a/account_usability/account.py
+++ b/account_usability/account.py
@@ -22,6 +22,11 @@ class AccountInvoice(models.Model):
     journal_id = fields.Many2one(track_visibility='onchange')
     partner_bank_id = fields.Many2one(track_visibility='onchange')
     fiscal_position_id = fields.Many2one(track_visibility='onchange')
+    # for those fields, the 'account' module sets track_visibility='always':
+    partner_id = fields.Many2one(track_visibility='onchange')
+    currency_id = fields.Many2one(track_visibility='onchange')
+    type = fields.Selection(track_visibility='onchange')
+    amount_untaxed = fields.Monetary(track_visibility='onchange')
     # I want to see the number of cancelled invoice in chatter
     move_id = fields.Many2one(track_visibility='onchange')
     # for invoice report
diff --git a/sale_usability/sale.py b/sale_usability/sale.py
index 3d7cee0..7783043 100644
--- a/sale_usability/sale.py
+++ b/sale_usability/sale.py
@@ -13,7 +13,10 @@ class SaleOrder(models.Model):
     date_order = fields.Datetime(track_visibility='onchange')
     date_confirm = fields.Date(track_visibility='onchange')
     client_order_ref = fields.Char(track_visibility='onchange')
+    # for partner_id, the 'sale' module sets track_visibility='always'
     partner_id = fields.Many2one(track_visibility='onchange')
+    # for amount_tax, the 'sale' module sets track_visibility='always'
+    amount_tax = fields.Monetary(track_visibility='onchange')
     partner_shipping_id = fields.Many2one(track_visibility='onchange')
     partner_invoice_id = fields.Many2one(track_visibility='onchange')
     pricelist_id = fields.Many2one(track_visibility='onchange')