# BR-64

> The Item standard identifier (BT-157) shall have a Scheme identifier.

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/br-64

## Official rule text

The Item standard identifier (BT-157) shall have a Scheme identifier.

## Why did my invoice fail BR-64?

The Item standard identifier (BT-157) — a globally standardized product identifier for a line item, such as a GTIN — must have a Scheme identifier declaring which registry the identifier comes from. The scheme (an ISO/IEC 6523 ICD value) is required so the identifier can be interpreted unambiguously.

## Common causes

- cac:Item/cac:StandardItemIdentification/cbc:ID has a value but no schemeID attribute.
- The schemeID is not a valid ISO 6523 ICD code (e.g. 0160 for GTIN).
- A seller's own article number was placed in StandardItemIdentification instead of SellersItemIdentification, so no scheme applies.

## How do I fix it?

```
<cac:StandardItemIdentification><cbc:ID schemeID="0160">04012345678901</cbc:ID></cac:StandardItemIdentification>.
```