# BT-54 Buyer country subdivision

State, province, or regional subdivision of the buyer address.

## Quick answer

State, province, or regional subdivision of the buyer address.

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

## In plain language

State, province, or regional subdivision of the buyer address.

State, province, or regional subdivision of the buyer address.

This field matters when the buyer address needs regional detail for routing, tax, or procurement matching.

## What you usually enter here

Region or province name

Typical valid values include: Nordrhein-Westfalen

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like:

## Examples in context

This field matters when the buyer address needs regional detail for routing, tax, or procurement matching.

Optional according to EN 16931-1.

## Valid Examples

- Nordrhein-Westfalen

## Related Fields

This field matters when the buyer address needs regional detail for routing, tax, or procurement matching.

- [BT-52 Buyer City](/resources/xrechnung/bt-52-buyer-city)
- [BT-53 Buyer Post Code](/resources/xrechnung/bt-53-buyer-post-code)
- [BT-55 Buyer Country Code](/resources/xrechnung/bt-55-buyer-country-code)

## 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-54

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
50 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:PostalAddress/cbc:CountrySubentity
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:PostalTradeAddress/ram:CountrySubDivisionName
```

## Why the standard cares about this field

### Business Context
This field matters when the buyer address needs regional detail for routing, tax, or procurement matching.

### 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)