Product Supplierinfo Revision

This module helps you manage changes in vendor prices over time. On the supplier price list (product.supplierinfo), each line now shows a 'Variation %' column next to the price, calculated automatically by comparing the current price with the price of the previous line it was copied from. A 'Previous info' link and a 'Previous Price' field keep the history of where the line came from.

From the supplier price list, you can select one or more lines and use the 'Duplicate Supplier Info' action. A wizard opens where you set a new start date, an optional end date, and a variation percentage. When you click Apply, the module creates a copy of each selected line with the new dates and a price increased or decreased by that percentage. The original line's end date is automatically set to the day before the new start date, so the old price stops applying when the new one begins.

After applying, Odoo shows the newly created lines in a filtered list. The variation percentage is stored and displayed with the same decimal precision as product prices. This module only touches supplier information on products; it does not change sales, purchases, or stock.