# BT-165 Invoice line item size

The size of the item in the invoice line.

## Quick answer

The size 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 size of the item in the invoice line.

The size of the item in the invoice line.

Specifies the size or dimensions of the item.

## What you usually enter here

Free text size description

Typical valid values include: Large, XL, 42 EU, 200x300cm

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-2

## Examples in context

Specifies the size or dimensions of the item.

Optional according to EN 16931-1.

## Valid Examples

- Large
- XL
- 42 EU
- 200x300cm

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

Specifies the size or dimensions of the item.

- [BT-138 Invoice line item name](/resources/xrechnung/bt-138-invoice-line-item-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-165

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
50 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:Item/cac:ItemDimension/cbc:AttributeID
```

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

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Specifies the size or dimensions 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)