[FIX] purchase_stock: return subcontracted product

- Create a product P with a subcontracted BOM
- Create a PO for P, 10 units
- Receive 10 units
- Return 3 units and specify 'To Refund'

13 units are considered received.

The reason is that we don't return to a vendor location, but an internal
location.

We subtract the quantity when the following conditions are met:
- we ask for a refund
- we return to an internal location
- the return location is not in the warehouse of the move

The solution is similar to odoo/enterprise#9647

opw-2235157

closes odoo#50119

X-original-commit: 5fd6c5b
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/purchase_stock/models/purchase.py

@@ -291,6 +291,15 @@ def _compute_qty_received(self):
                             # receive the product physically in our stock. To avoid counting the
                             # quantity twice, we do nothing.
                             pass
+                        elif (
+                            move.location_dest_id.usage == "internal"
+                            and move.to_refund
+                            and move.location_dest_id
+                            not in self.env["stock.location"].search(
+                                [("id", "child_of", move.warehouse_id.view_location_id.id)]
+                            )
+                        ):
+                            total -= move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
                         else:
                             total += move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
                 line.qty_received = total