# BT-164 Invoice line item model name

The model name of the item in the invoice line.

## Quick answer

The model name 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 model name of the item in the invoice line.

The model name of the item in the invoice line.

Specifies the specific model of the item.

## What you usually enter here

Free text model name

Typical valid values include: iPhone 15 Pro, Galaxy S24, X5 M60i, Air Max 270

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-2

## Examples in context

Specifies the specific model of the item.

Optional according to EN 16931-1.

## Valid Examples

- iPhone 15 Pro
- Galaxy S24
- X5 M60i
- Air Max 270

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

Specifies the specific model of the item.

- [BT-138 Invoice line item name](/resources/xrechnung/bt-138-invoice-line-item-name)
- [BT-163 Invoice line item brand name](/resources/xrechnung/bt-163-invoice-line-item-brand-name)

## 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-164

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
100 characters

### Since Version:
Optional

## XML Implementation

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

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

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Specifies the specific model of the item.

### 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)