germany-einvoiceSource-cited draft Use this skill whenever asked about German e-invoicing, XRechnung, ZUGFeRD, ERechV, E-Rechnungsverordnung, Peppol BIS Billing Germany, Leitweg-ID, OZG-RE invoice portal, B2B e-invoicing mandate Germany, Wachstumschancengesetz, EN 16931 Germany, GoBD e-invoice archiving, or any question about issuing, receiving, validating, or archiving electronic invoices in Germany. Also trigger when preparing XRechnung XML invoices, configuring Peppol endpoints for German public-sector invoicing, handling B2B e-invoice reception requirements, or advising on ZUGFeRD profile selection. This skill covers XRechnung CIUS, ZUGFeRD hybrid format, Peppol transmission, mandatory fields, validation rules, GoBD archiving, penalties, and interaction with German VAT returns. ALWAYS read this skill before touching any German e-invoicing work.