The refund process is handled via the correction invoice in SIGN ES, utilizing either the SUBSTITUTION or DIFFERENCES correction method. By default, SIGN ES uses the SUBSTITUTION method for corrections.
In the context of retail transactions, the typical procedure involves the issuance of a correcting invoice to ensure that the financial transaction is accurately adjusted. In any correction invoice, the correction cause must be clearly indicated. It is essential to use a pre-defined code as outlined in the Spanish regulations (VAT Law). For simplified correction invoices, SIGN ES assigns the correction code by default.