Product Supplier Code in Purchase

This module adds a "supplier code" column to purchase order lines, so buyers can see the reference the vendor uses for the product directly on the order.

• The code is filled in automatically when the vendor and the product are set on a line. It looks for the vendor's product reference stored on the product's vendor list, first for the exact product, then for the product template, and copies it onto the line.
• The field stays editable, so a buyer can correct or complete the code manually if needed.
• The column appears in the purchase order form (inside the order lines list, right after the product) and in the purchase order line list view.
• When Odoo adds the vendor to the product's vendor list from a purchase order, the supplier code entered on the line is also saved back onto the vendor information of the product, so it is remembered for next time. If the user has no permission to change the product, this saving is simply skipped.

It touches the purchase order and purchase order line models and the vendor information on products. No new menus or reports are added.