# BT-145 Item classification identifier scheme version identifier

The version of the scheme under which the item is classified.

## Quick answer

The version of the scheme under which the item is classified.

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

## In plain language

The version of the scheme under which the item is classified.

The version of the scheme under which the item is classified.

Specifies which version of the classification scheme is being used.

## What you usually enter here

Version identifier

Typical valid values include: 2024, 2023, 1.0, 2.1

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-2

## Examples in context

Specifies which version of the classification scheme is being used.

Optional according to EN 16931-1.

## Valid Examples

- 2024
- 2023
- 1.0
- 2.1

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAA

## Related Fields

Specifies which version of the classification scheme is being used.

- [BT-143 Item classification identifier](/resources/xrechnung/bt-143-item-classification-identifier)
- [BT-144 Item classification identifier scheme identifier](/resources/xrechnung/bt-144-item-classification-identifier-scheme-identifier)

## 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-145

### 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/@listVersionID
```

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

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Specifies which version of the classification scheme is being 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)