italy-einvoiceSource-cited draft Use this skill whenever asked about Italian e-invoicing, FatturaPA, Sistema di Interscambio (SDI), electronic invoicing compliance in Italy, Codice Destinatario, PEC invoicing, fattura elettronica, TD document types, cross-border e-invoicing via SDI, conservazione sostitutiva, or any question about issuing, receiving, validating, or archiving electronic invoices in Italy. Also trigger when preparing or reviewing XML invoices for SDI submission, handling SDI rejection (scarto) errors, configuring Codice Destinatario or PEC routing, or advising on FatturaPA technical format compliance. This skill covers the FatturaPA XML schema, SDI transmission channels, mandatory fields, validation rules, archiving, penalties, and interaction with Italian VAT returns. ALWAYS read this skill before touching any Italian e-invoicing work.