# BT-89 Mandate reference identifier

Mandate reference for direct debit payments.

## Quick answer

Mandate reference for direct debit payments.

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

## In plain language

Mandate reference for direct debit payments.

Mandate reference for direct debit payments.

Use this when the invoice requests SEPA direct debit and the buyer has granted a debit mandate.

## What you usually enter here

Direct-debit mandate reference

Typical valid values include: MANDATE-7788

Optional according to EN 16931-1, but required by the business scenario for direct debit.

## What goes wrong often

Avoid values like:

## Examples in context

Use this when the invoice requests SEPA direct debit and the buyer has granted a debit mandate.

Optional according to EN 16931-1, but required by the business scenario for direct debit.

## Valid Examples

- MANDATE-7788

## Related Fields

Use this when the invoice requests SEPA direct debit and the buyer has granted a debit mandate.

- [BT-90 Bank assigned creditor identifier](/resources/xrechnung/bt-90-bank-assigned-creditor-identifier)
- [BT-91 Debited account identifier](/resources/xrechnung/bt-91-debited-account-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-89

### Data Type:
identifier

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
50 characters

### Since Version:
Conditional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:PaymentMeans/cac:PaymentMandate/cbc:ID
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradePaymentTerms/ram:DirectDebitMandateID
```

## Why the standard cares about this field

### Business Context
Use this when the invoice requests SEPA direct debit and the buyer has granted a debit mandate.

### Legal Requirement
Optional according to EN 16931-1, but required by the business scenario for direct debit.

## 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)