# BT-45 Buyer trading name

Trading or brand name of the buyer when it differs from the legal buyer name.

## Quick answer

Trading or brand name of the buyer when it differs from the legal buyer name.

> **Buyer details**: Who receives the invoice and which buyer records or routing data must match.

## In plain language

Trading or brand name of the buyer when it differs from the legal buyer name.

Trading or brand name of the buyer when it differs from the legal buyer name.

This helps the seller address the invoice with the name the buyer actually uses in day-to-day business.

## What you usually enter here

Trading or brand name

Typical valid values include: City Utilities

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like:

## Examples in context

This helps the seller address the invoice with the name the buyer actually uses in day-to-day business.

Optional according to EN 16931-1.

## Valid Examples

- City Utilities

## Related Fields

This helps the seller address the invoice with the name the buyer actually uses in day-to-day business.

- [BT-44 Buyer Name](/resources/xrechnung/bt-44-buyer-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-45

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
200 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:PartyName/cbc:Name
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:SpecifiedLegalOrganization/ram:TradingBusinessName
```

## Why the standard cares about this field

### Business Context
This helps the seller address the invoice with the name the buyer actually uses in day-to-day business.

### 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)