# BT-89 Mandate reference identifier

Mandate reference for direct debit payments.

## Quick answer

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

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-89)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-89)

## 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
```

## Create an XRechnung from your PDF

The converter reads the invoice and shows the fields it found before download, so you can check and correct the values. No PDF? Fill in the XRechnung directly in the form.

- [Convert invoice](/en/pdf-to-xrechnung)
- [Fill in XRechnung in the form](/en/create-xrechnung)

Download requires an account. Subscriptions from €10/month with annual billing (excl. taxes), or €5 per conversion (excl. taxes) without a subscription.

## 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/)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)