errorEN16931
UBL-SR-42:Party tax scheme shall occur maximum twice in accounting supplier party
Your seller party (AccountingSupplierParty) contains more than two PartyTaxScheme elements. EN16931 allows maximum two (one VAT scheme and optionally one other tax scheme).
We can fix this automatically
AUTO-FIXAuto-fix: Keep the VAT scheme (TaxScheme/ID = "VAT") and one other tax scheme, remove any additional PartyTaxScheme elements.
No manual changes needed
Upload and Fix NowWhy This Error Matters
Invoice will be rejected by EN16931 validators. Only VAT identifier and one additional tax scheme are permitted per seller.
Common Causes
- ERP exports all tax registrations instead of just VAT and one other
- Multiple country tax schemes exported when only two allowed
- Template includes extra PartyTaxScheme elements
- Data migration added duplicate tax scheme entries
- Manual XML editing introduced extra tax schemes
Frequently Asked Questions
Your seller party (AccountingSupplierParty) contains more than two PartyTaxScheme elements. EN16931 allows maximum two (one VAT scheme and optionally one other tax scheme).
Your seller party (AccountingSupplierParty) contains more than two PartyTaxScheme elements. EN16931 allows maximum two (one VAT scheme and optionally one other tax scheme). You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, UBL-SR-42 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted.
Many instances of UBL-SR-42 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues.
See Also
Last updated: 16 January 2026
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