[FIX] Fixes commented by @pablocm-aserti

pos_pricelist/data/pos_order.yml

@@ -22,4 +22,8 @@
 #
 ##############################################################################
 
+-
+  !context
+  noupdate: 1
+
 - !function {model: pos.order, name: _install_tax_detail}

pos_pricelist/models/point_of_sale.py

@@ -75,7 +75,7 @@ class PosOrder(models.Model):
     _inherit = "pos.order"
 
     taxes = fields.One2many(comodel_name='pos.order.tax',
-                            inverse_name='pos_order')
+                            inverse_name='pos_order', readonly=True)
 
     @api.model
     def _amount_line_tax(self, line):

pos_pricelist/views/point_of_sale_view.xml

@@ -12,8 +12,8 @@
             	</xpath>
                 <page string="Payments" position="after">
                     <page string="Taxes">
-                        <field name="taxes" widget="one2many_list">
-                            <tree string="Taxes detail">
+                        <field name="taxes">
+                            <tree editable="bottom" string="Taxes detail">
                                 <field name="name"/>
                                 <field name="base"/>
                                 <field name="amount"/>