PEPPOL-EN16931-R051: currencyID differs from the invoice currency

StandardPeppol BIS Billing 3.0 (OpenPeppol)SeverityError: the invoice is rejectedSyntaxUBLBusiness terms

BT-5 Invoice currency code
BT-111 Invoice total VAT amount in accounting currency

Applies toInvoices and credit notes sent over the Peppol network (UBL) and, because XRechnung embeds the Peppol rule set, every XRechnung as well.

Official rule text

[PEPPOL-EN16931-R051] All currencyID attributes must have the same value as the invoice currency code (BT-5), except for the invoice total VAT amount in accounting currency (BT-111).

Why this error occurs

In a Peppol UBL invoice every amount must be in the invoice currency (BT-5); the only exception is the VAT total in the accounting currency (BT-111). The rule checks that the currencyID attribute of every cbc:Amount, cbc:BaseAmount, cbc:PriceAmount, cbc:TaxAmount, cbc:TaxableAmount, cbc:LineExtensionAmount and all cac:LegalMonetaryTotal amounts equals cbc:DocumentCurrencyCode. It fires when a template hard-codes currencyID="EUR" while the document currency is something else, or when prices are exported in the supplier's currency on a foreign-currency invoice.

How to fix it

Generate every currencyID from the value of cbc:DocumentCurrencyCode instead of hard-coding it. For a foreign-currency invoice convert all prices and amounts to that currency before export. Keep exactly one cac:TaxTotal without subtotals in the accounting currency if BT-6 is used; all other amounts, including line prices, stay in the document currency. This rule applies to UBL only.

Example (valid)

<cbc:DocumentCurrencyCode>SEK</cbc:DocumentCurrencyCode>
...
<cbc:LineExtensionAmount currencyID="SEK">1000.00</cbc:LineExtensionAmount>
<cbc:PriceAmount currencyID="SEK">500.00</cbc:PriceAmount>

What the validator checks

Checked element (context):

UBL

cbc:Amount | cbc:BaseAmount | cbc:PriceAmount | cac:TaxTotal[cac:TaxSubtotal]/cbc:TaxAmount | cac:TaxSubtotal/cbc:TaxAmount | cbc:TaxableAmount | cbc:LineExtensionAmount | cbc:TaxExclusiveAmount | cbc:TaxInclusiveAmount | cbc:AllowanceTotalAmount | cbc:ChargeTotalAmount | cbc:PrepaidAmount | cbc:PayableRoundingAmount | cbc:PayableAmount

Test (XPath):

@currencyID = $documentCurrencyCode

Check your invoice

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Check your invoice →

Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

PEPPOL-EN16931-R001 Business process identifier (BT-23) is missing
PEPPOL-EN16931-R002 No more than one note is allowed on document level, unless both the buyer and seller…
PEPPOL-EN16931-R003 Neither buyer reference nor purchase order reference given
PEPPOL-EN16931-R004 Specification identifier is not the Peppol BIS Billing 3.0 identifier
PEPPOL-EN16931-R005 VAT accounting currency equals the invoice currency
PEPPOL-EN16931-R006 Only one invoiced object is allowed on document level
PEPPOL-EN16931-R007 Business process identifier has the wrong format
PEPPOL-EN16931-R008 Document contains empty elements

Frequently asked questions

What does PEPPOL-EN16931-R051 mean?

PEPPOL-EN16931-R051 is a peppol bis billing 3.0 rule: All currencyID attributes must have the same value as the invoice currency code (BT-5), except for the invoice total VAT amount in accounting currency (BT-111).

Will my invoice be rejected because of PEPPOL-EN16931-R051?

Yes. PEPPOL-EN16931-R051 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.

Which formats does PEPPOL-EN16931-R051 apply to?

Invoices and credit notes sent over the Peppol network (UBL) and, because XRechnung embeds the Peppol rule set, every XRechnung as well. Syntax: UBL.

Source: Peppol BIS Billing 3.0.20 (November 2025). Catalogue generated from the official schematron on 2026-10-14.