Purchase Stock Return Request

This module extends the return request feature so that returns sent back to a supplier are connected to the purchase orders they came from.

• On a return request, a new "Purchases" button appears in the top button box once the request is confirmed. It opens the related purchase orders, or the single purchase order if there is only one.
• A new menu "Return Request" is added under the Purchase menu, showing only supplier return requests. New requests created from there default to supplier returns with the refund option enabled.
• When a return request is confirmed, Odoo automatically fills in the involved purchase orders based on the original receipts.
• The return moves keep the link to the original purchase order line and the refund flag, so the return stays connected to the purchase.
• The printed return report gains extra columns for purchase users: the order reference, whether the line is to be refunded, the purchase price and the subtotal. A totals block shows subtotal, taxes and total for supplier returns.
• Prices and taxes are taken from the original purchase order line, so the report reflects the real purchase value of the returned goods.

It touches the return request model stock.return.request and the purchase order model purchase.order.