# UBL-SR-20

> Payee identifier shall occur maximum once, if the Payee is different from the Seller

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/ubl-sr-20

## Official rule text

Payee identifier shall occur maximum once, if the Payee is different from the Seller

## Why did my invoice fail UBL-SR-20?

The Payee identifier (BT-60), in cac:PayeeParty/cac:PartyIdentification/cbc:ID, is the electronic identifier of a payee different from the seller and may occur at most once. Only one such identifier is permitted for the single payee in BG-10.

## Common causes

- Several cac:PartyIdentification elements are generated for the payee.
- Both a GLN and an internal account reference are mapped as payee identifiers.
- A scheme-qualified and unqualified id are both emitted for the same payee.

## How do I fix it?

```
Keep one identifier: <cac:PayeeParty><cac:PartyIdentification><cbc:ID schemeID="0088">7300010000002</cbc:ID></cac:PartyIdentification></cac:PayeeParty> and drop the remaining ones.
```