[IMP] delivery: HS codes for product

HS Code is a standardized code used to describe products categories, and
facilitate customs clearance.
(https://en.wikipedia.org/wiki/Harmonized_System)

Some international transporters require HS codes and use them. We allow
users to store them on product.template's.

addons/delivery/__openerp__.py

@@ -18,6 +18,7 @@ invoices from picking, the system is able to add and compute the shipping line.
         'security/ir.model.access.csv',
         'views/delivery_view.xml',
         'views/partner_view.xml',
+        'views/product_template_view.xml',
         'data/delivery_data.xml',
         'views/report_shipping.xml',
         'views/report_deliveryslip.xml'

addons/delivery/models/product_template.py

@@ -1,12 +1,14 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from openerp import api, models
+from openerp import api, models, fields
 
 
 class ProductTemplate(models.Model):
     _inherit = 'product.template'
 
+    hs_code = fields.Char(string="HS Code", help="Standardized code for international shipping and goods declaration", oldname="x_hs_code")
+
     @api.multi
     def write(self, vals):
         res = super(ProductTemplate, self).write(vals)

addons/delivery/views/product_template_view.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+<record model="ir.ui.view" id="delivery.product_template_hs_code">
+    <field name="name">product.template.form.hs_code</field>
+    <field name="model">product.template</field>
+    <field name="inherit_id" ref="product.product_template_form_view"/>
+    <field name="arch" type="xml">
+        <form>
+            <field name="active" position="after">
+                <field name="hs_code"/>
+            </field>
+        </form>
+    </field>
+</record>
+
+</odoo>