PEPPOL-EN16931-R051:Currency codes are not consistent
All amounts in the invoice must use the same currency, matching the document currency code. For example, if the invoice is in EUR, every amount, tax total, line item, and allowance/charge must also use EUR as the currency code. The only exception is the accounting currency tax amount (BT-111).
Engine Classification
Sets all currencyID attributes to match the DocumentCurrencyCode
Confidence: 95% · Applied automatically in pipeline
What is PEPPOL-EN16931-R051?
PEPPOL-EN16931-R051 is a fatal validation rule defined in the Peppol BIS 3.0 specification. It validates the @currencyID element in the UBL invoice XML.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Target path: //@currencyID
Why This Error Matters
Invoice will be rejected by PEPPOL validation. Mixed currencies (except for accounting VAT) are not allowed.
PEPPOL-EN16931-R051 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Rejected by PEPPOL Access Points
- ·Error returned: PEPPOL-EN16931-R051
- ·Specification: Peppol BIS 3.0
How to Fix It
Find the document currency
Check the DocumentCurrencyCode at the top of the invoice (e.g. EUR, SEK, GBP).
Check all amounts
Every amount in the invoice should have currencyID matching the document currency.
Fix mismatches
Update any currencyID attributes that do not match. The only exception is BT-111 (accounting currency tax amount) if a TaxCurrencyCode is specified.
Before / After
<cac:LegalMonetaryTotal> <cbc:PrepaidAmount><!-- invalid or missing value --></cbc:PrepaidAmount> </cac:LegalMonetaryTotal>
<cac:LegalMonetaryTotal> <cbc:PrepaidAmount>correct-value</cbc:PrepaidAmount> </cac:LegalMonetaryTotal>
Technical Reference
//@currencyIDCommon Causes
- ·ERP uses different currency fields for headers and lines
- ·Template has hardcoded currency that differs from invoice currency
- ·Copy-paste from invoice with different currency
Seeing this in production? The API handles PEPPOL-EN16931-R051 automatically. See the fix response →
Commonly Seen In
See Also
Related Errors
Last updated: 27 February 2026
Handle PEPPOL-EN16931-R051 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.