Documente-vanzare (18)StornoSaleInvoiceStornoSaleInvoice POST /api/rpc/StornoSaleInvoice Metoda permite stornarea unei facturi de vanzare. Intoarce id-ul facturii de storno salvate. Request Responses200401502NextUp response envelope (check Result + Error).Missing or invalid token.Proxy/upstream failure (target NextUp unreachable).