# BT-159 Invoice line item commodity classification scheme

The scheme used for the commodity classification of the item.

## Quick answer

The scheme used for the commodity classification of the item.

> **Line items**: The goods or services on each invoice line, including quantities, prices, and VAT.

## In plain language

The scheme used for the commodity classification of the item.

The scheme used for the commodity classification of the item.

Specifies the classification scheme used.

## What you usually enter here

Classification scheme identifier

Typical valid values include: HS, CN, NCM, TARIC

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-2

## Examples in context

Specifies the classification scheme used.

Optional according to EN 16931-1.

## Valid Examples

- HS
- CN
- NCM
- TARIC

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAA

## Related Fields

Specifies the classification scheme used.

- [BT-138 Invoice line item name](/resources/xrechnung/bt-138-invoice-line-item-name)
- [BT-158 Invoice line item commodity classification](/resources/xrechnung/bt-158-invoice-line-item-commodity-classification)

## XML mapping and field facts

Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.

### Field ID:
BT-159

### Data Type:
identifier

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
20 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode/@listID
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:SpecifiedTradeProduct/ram:DesignatedProductClassification/ram:ClassCode/@listID
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Specifies the classification scheme used.

### Legal Requirement
Optional according to EN 16931-1.

## Official sources and tools

- [KoSIT Validator](https://erechnungsvalidator.service-bw.de/)
- [Invoice Converter](/pdf-to-xrechnung)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)