# UBL-SR-02

> Receive advice identifier shall occur maximum once

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/ubl-sr-02

## Official rule text

Receive advice identifier shall occur maximum once

## Why did my invoice fail UBL-SR-02?

The Receiving advice reference (BT-15) may occur at most once on the invoice, so only a single cac:ReceiptDocumentReference is allowed. This business term links the invoice to one receiving/receipt advice, and EN 16931 permits no more than one such reference.

## Common causes

- Multiple cac:ReceiptDocumentReference elements are present on the invoice.
- Several goods-receipt notes were each mapped to a separate ReceiptDocumentReference.
- A receiving advice reference was duplicated during mapping from the source system.

## How do I fix it?

```
Keep exactly one: <cac:ReceiptDocumentReference><cbc:ID>RCV-ADV-451</cbc:ID></cac:ReceiptDocumentReference> and remove any extra occurrences.
```