EU e-invoicing in 2026 - how the flow works, from issuance to validation

The difference between a working implementation and one that creates extra manual work lies in what happens after you click 'send'.

• The invoice is generated from the sales order with pre-validated partner data.
• The system builds the compliant XML and validates it locally before submission.
• Transmission is sent to the tax authority or Peppol network, receiving a tracking index.
• Status is queried automatically until acceptance or rejection is confirmed.
• The sealed invoice is archived and linked directly to the commercial document.

Almost all rejections stem from master data issues, not the invoice itself. This is why validation must happen before submission, not after.

• Incomplete or non-compliant VAT IDs or partner addresses.
• Invalid unit of measurement codes or VAT rates for the specific transaction type.
• Rounding differences between line items and the document total.
• Missing references to original documents in the case of credit notes or reversals.

CRMconnect is not a simple XML converter. The invoice originates from a real order, partners are validated at entry, and transmission and status tracking are fully automated. Errors are highlighted directly on the field that caused them. Once accepted, the document exports to your accounting software (like SAP, Dynamics 365, or Sage) with accounts already mapped.