# BT-161 Invoice line item additional property name

The name of an additional property of the item in the invoice line.

## Quick answer

The name of an additional property of the item in the invoice line.

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

## In plain language

The name of an additional property of the item in the invoice line.

The name of an additional property of the item in the invoice line.

Used to specify additional item characteristics.

## What you usually enter here

Free text property name

Typical valid values include: Color, Size, Material, Weight

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-2

## Examples in context

Used to specify additional item characteristics.

Optional according to EN 16931-1.

## Valid Examples

- Color
- Size
- Material
- Weight

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

Used to specify additional item characteristics.

- [BT-138 Invoice line item name](/resources/xrechnung/bt-138-invoice-line-item-name)
- [BT-162 Invoice line item additional property value](/resources/xrechnung/bt-162-invoice-line-item-additional-property-value)

## 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-161

### Data Type:
text

### Cardinality:
0..n

### Requirement:
Optional

### Max Length:
100 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:Item/cac:AdditionalItemProperty/cbc:Name
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:SpecifiedTradeProduct/ram:ApplicableProductCharacteristic/ram:Description
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Used to specify additional item characteristics.

### 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)