To register a return in the Barcode app, first make sure the return transfer is already created from the Inventory or Sales app. Then open the Barcode app, tap Operations → Receipts, and select the return transfer from the list. Scan the barcode from the return slip sent by the customer, then scan the barcode of the returned product. Once all products are scanned, click Validate to complete the return and update stock.

Note: There is no dedicated "Return" operation type barcode in native Odoo 19. Returns are processed as reverse receipts; the workflow is the same as a standard receipt, just on the return transfer record.