UBL-SR-26
EN 16931-1 layer: en16931
Checked against Peppol BIS Billing 3.0 2026.5
What does UBL-SR-26 mean? Payment reference shall occur maximum once
Why did my invoice fail UBL-SR-26?
The Payment reference (BT-83), in cac:PaymentMeans/cbc:PaymentID, is the remittance reference the buyer quotes when paying (e.g. a structured creditor reference), and it may occur at most once. EN 16931 models a single payment reference for the invoice.
Official rule text
Payment reference shall occur maximum once
Common causes
- cbc:PaymentID is repeated inside a single cac:PaymentMeans element.
- Multiple cac:PaymentMeans elements each carry a different PaymentID.
- Both an OCR/KID reference and an invoice number are emitted as separate PaymentID values.
How do I fix it?
Use a single reference: <cac:PaymentMeans>...<cbc:PaymentID>RF18539007547034</cbc:PaymentID>...</cac:PaymentMeans> and remove any additional PaymentID occurrences.
Related rules
UBL-SR-01 · UBL-SR-02 · UBL-SR-03 · UBL-SR-04 · UBL-SR-05 · UBL-SR-06 · UBL-SR-07 · UBL-SR-08
Check your invoice against this rule
Paste it into the live demo, or call POST /v1/validate. See the quickstart.