Testing before production
How to test an XML e-invoice before production deployment?
Short answer
The generated XML should be verified by the official validator of the Peppol network at testbed.peppol.org/validation, who will check the formal structure of the UBL as well as the business rules of EN 16931 and Peppol BIS Billing 3.0.
Conclusion
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.