# BT-61 Payee legal registration identifier

Legal registration identifier of the payee, such as a register number.

## Quick answer

Legal registration identifier of the payee, such as a register number.

> **Delivery and payment**: Delivery dates, payment means, and the operational context around settlement.

- validate
- convert

## In plain language

Legal registration identifier of the payee, such as a register number.

Legal registration identifier of the payee, such as a register number.

Use this when the payment recipient needs to be proven as a specific legal entity.

## What you usually enter here

Registry identifier

Typical valid values include: HRB 88991

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like:

## Examples in context

Use this when the payment recipient needs to be proven as a specific legal entity.

Optional according to EN 16931-1.

## Valid Examples

- HRB 88991

## Related Fields

Use this when the payment recipient needs to be proven as a specific legal entity.

- [BT-59 Payee name](/resources/xrechnung/bt-59-payee-name)
- [BT-60 Payee identifier](/resources/xrechnung/bt-60-payee-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-61

### Data Type:
identifier

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
50 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:PayeeParty/cac:PartyLegalEntity/cbc:CompanyID
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:PayeeTradeParty/ram:SpecifiedLegalOrganization/ram:ID
```

## Why the standard cares about this field

### Business Context
Use this when the payment recipient needs to be proven as a specific legal entity.

### 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)