diff --git a/addons/l10n_fr_certification/models/account.py b/addons/l10n_fr_certification/models/account.py
index 8d1a26d0ad6..ecb0f5aff8b 100644
--- a/addons/l10n_fr_certification/models/account.py
+++ b/addons/l10n_fr_certification/models/account.py
@@ -16,8 +16,8 @@ LINE_FIELDS = ['debit', 'credit', 'account_id', 'move_id', 'partner_id']
 class AccountMove(models.Model):
     _inherit = "account.move"
 
-    l10n_fr_secure_sequence_number = fields.Integer(readonly=True)
-    l10n_fr_hash = fields.Char(readonly=True)
+    l10n_fr_secure_sequence_number = fields.Integer(readonly=True, copy=False)
+    l10n_fr_hash = fields.Char(readonly=True, copy=False)
     l10n_fr_string_to_hash = fields.Char(compute='_compute_string_to_hash', readonly=True, store=False)
 
     def _get_new_hash(self, secure_seq_number):
diff --git a/addons/point_of_sale/tools/posbox/overwrite_after_init/etc/xdg/openbox/autostart b/addons/point_of_sale/tools/posbox/overwrite_after_init/etc/xdg/openbox/autostart
index e2b61e2f591..15908b4c5aa 100755
--- a/addons/point_of_sale/tools/posbox/overwrite_after_init/etc/xdg/openbox/autostart
+++ b/addons/point_of_sale/tools/posbox/overwrite_after_init/etc/xdg/openbox/autostart
@@ -3,4 +3,11 @@ xset s off
 xset -dpms
 
 export HOME=/tmp
-/usr/bin/firefox http://localhost:8069/point_of_sale/display &
+
+DISPLAY_URL='http://localhost:8069/point_of_sale/display'
+
+# wait until odoo is ready, otherwise you will have to plug a
+# keyboard into the posbox just to refresh firefox
+until wget -q "${DISPLAY_URL}" -O /dev/null ; do sleep 1 ; done
+
+/usr/bin/firefox "${DISPLAY_URL}" &
diff --git a/addons/point_of_sale/views/pos_order_view.xml b/addons/point_of_sale/views/pos_order_view.xml
index 6a5b21a329b..2f4cdd42ce1 100644
--- a/addons/point_of_sale/views/pos_order_view.xml
+++ b/addons/point_of_sale/views/pos_order_view.xml
@@ -38,7 +38,7 @@
                                 <field name="price_unit" widget="monetary"/>
                                 <field name="discount" widget="monetary"/>
                                 <field name="tax_ids_after_fiscal_position" widget="many2many_tags"/>
-                                <field name="tax_ids" invisible="1"/>
+                                <field name="tax_ids" widget="many2many_tags" invisible="1"/>
                                 <field name="price_subtotal" widget="monetary"/>
                                 <field name="price_subtotal_incl" widget="monetary"/>
                             </tree>
@@ -51,7 +51,7 @@
                                     <field name="price_subtotal" invisible="1" widget="monetary"/>
                                     <field name="price_subtotal_incl" invisible="1" widget="monetary"/>
                                     <field name="tax_ids_after_fiscal_position" widget="many2many_tags"/>
-                                    <field name="tax_ids" invisible="1"/>
+                                    <field name="tax_ids" widget="many2many_tags" invisible="1"/>
                                     <field name="notice"/>
                                 </group>
                             </form>