PL-R-006:Currency must be PLN for KSeF
Invoices to Polish KSeF typically require PLN amounts.
Engine Classification
Financial or legal field · Modification blocked by policy
Reason: KSeF typically requires invoices in PLN (Polish Zloty). Changing the currency requires recalculating all amounts at the appropriate exchange rate, which is a financial calculation that cannot be automated safely. Issue the invoice in PLN from your source system, or ensure foreign currency invoices include proper PLN equivalents per Polish regulations.
What is PL-R-006?
PL-R-006 is a fatal validation rule defined in the ubl-2.1 specification (POL national rules). It validates the DocumentCurrencyCode element under Invoice 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: XPath: /Invoice/cbc:DocumentCurrencyCode
Why This Error Matters
KSeF requires amounts in Polish zloty for tax reporting.
PL-R-006 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.
Validator Behavior
- ·Causes invoice rejection
- ·Fails UBL schema validation
- ·Error returned: PL-R-006
- ·Specification: ubl-2.1
How to Fix It
Set currency
DocumentCurrencyCode = PLN
Or convert
Include PLN equivalents for VAT
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Missing or empty element triggers cbc:DocumentCurrencyCode error --> <cbc:DocumentCurrencyCode></cbc:DocumentCurrencyCode>
<!-- Provide the required value --> <cbc:DocumentCurrencyCode>VALID_VALUE</cbc:DocumentCurrencyCode>
Technical Reference
XPath: /Invoice/cbc:DocumentCurrencyCodeCommon Causes
- ·Using EUR without PLN conversion
- ·Wrong currency code
Seeing this in production? The API handles PL-R-006 automatically. See the fix response →
Frequently Asked Questions
Invoices to Polish KSeF typically require PLN amounts.
Use PLN as document currency or include PLN conversion. This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.
Yes, PL-R-006 is a critical error that will cause invoice rejection. It must be fixed before submission.
Related Content
Last updated: 3 March 2026
Detect PL-R-006 Before Submission
This error involves a financial or legal field that cannot be auto-modified. The compliance engine flags it immediately with a clear diagnosis so your team can fix it at the source.