A new version of the validations document “Validations and errors document (1-1-2021)” has been published in the “Technical Information” section of the “SII – Immediate Supply of VAT Information” portal. Validation number 12 is updated and validation number 8 is eliminated from the book of issued invoices. Validations number 2 and 10 are eliminated from the received invoice book.
Source: agenciatributaria.es