Octopus.be
Octopus
Using Octopus for Belgian e-invoicing? Validate your Peppol exports to catch KBO enterprise number format issues and VAT errors before rejection. Get ready for the 2026 B2B mandate.
Visit OctopusSupported E-Invoice Formats
| Format | Support Level |
|---|---|
| Peppol BIS 3.0 | Native Support |
| UBL-BE | Native Support |
| Mercurius | Native Support |
Common Validation Errors
These errors are frequently encountered when validating e-invoices from Octopus. Click on any error to see the fix.
BR-BE-10Very CommonBelgian enterprise number format
Belgian enterprise numbers (KBO/BCE) require format 0XXX.XXX.XXX with schemeID="0208". Octopus sometimes exports without dots or scheme.
BR-BE-11CommonBelgian VAT number format
Like Dutch software, Belgian VAT numbers need BE prefix.
PEPPOL-EN16931-R020OccasionalMissing seller electronic address
Cross-border invoices may incorrectly mix EUR amounts with other currency indicators.
About Octopus
Octopus is popular Belgian accounting software with a certified built-in Peppol Access Point. It supports full send/receive of e-invoices and has direct connection to the Mercurius B2G platform.
Validate Your Invoice
Export your invoice from Octopus and validate it against Peppol and EN16931 rules.
Validate FreeHow to Validate
- 1Export your invoice as UBL or XML from Octopus
- 2Upload the file to our validator
- 3Review errors and warnings with suggested fixes
- 4Fix issues in Octopus and re-export