[FIX] point_of_sale: restrict field pos_order_count to users in POS/User group

addons/point_of_sale/models/res_partner.py

@@ -7,7 +7,11 @@ class ResPartner(models.Model):
     _inherit = 'res.partner'
 
     barcode = fields.Char(string='Barcode', help="BarCode", oldname='ean13')
-    pos_order_count = fields.Integer(compute='_compute_pos_order', help="The number of point of sale orders related to this customer")
+    pos_order_count = fields.Integer(
+        compute='_compute_pos_order',
+        help="The number of point of sale orders related to this customer",
+        groups="point_of_sale.group_pos_user",
+    )
 
     def _compute_pos_order(self):
         partners_data = self.env['pos.order'].read_group([('partner_id', 'in', self.ids)], ['partner_id'], ['partner_id'])

addons/point_of_sale/views/res_partner_view.xml

@@ -4,6 +4,7 @@
             <field name="name">res.partner.pos.form.inherit</field>
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="sale.res_partner_view_buttons"/>
+            <field name="groups_id" eval="[(4, ref('group_pos_user'))]"/>
             <field name="arch" type="xml">
                 <xpath expr="//field[@name='sale_order_count']" position="after">
                     <button class="oe_stat_button" type="action" name="%(point_of_sale.action_pos_pos_form)d" 
@@ -24,6 +25,7 @@
             <field name="name">res.partner.pos.kanban.inherit</field>
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="sale.crm_lead_partner_kanban_view"/>
+            <field name="groups_id" eval="[(4, ref('group_pos_user'))]"/>
             <field name="arch" type="xml">
                 <xpath expr="//field[@name='sale_order_count']" position="after">
                     <field name="pos_order_count"/>