Belgium 2028 near-real-time e-reporting readiness: Peppol 5-corner CTC transaction-report payload prep, VAT-return grid reconciliation and a readiness rule pack (BYOK, no transport)
Deep EN 16931 / Peppol BIS 3.0 business-rule validator for the Belgian B2B mandate (Jan 2026): BR-CO calculation chain, VAT-category rules (S/Z/E/AE/G/O/K), decimal & payment-terms rules layered on the Peppol CIUS rule pack
Belgium Peppol BIS Billing 3.0 UBL generator: BE CIUS, CBE enterprise-number handling, EN 16931 validation, UBL export/hand-off
Belgium B2B mandate (Jan 2026): Peppol BIS 3.0 CIUS pre-flight validation of EN 16931 invoices for the FOD/SPF Peppol network, with modulo-97 VAT check and BYOK-free endpoint routing rules