# BT-78 Deliver to post code

Postal code of the delivery address.

## Quick answer

Postal code of the delivery address.

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

- validate
- convert

## In plain language

Postal code of the delivery address.

Postal code of the delivery address.

The postal code makes the delivery destination machine-readable for routing, logistics, and matching.

## What you usually enter here

National postal code

Typical valid values include: 50667, 3011AA

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: , 123456789012345678901

## Examples in context

The postal code makes the delivery destination machine-readable for routing, logistics, and matching.

Optional according to EN 16931-1.

## Valid Examples

- 50667
- 3011AA

## Invalid Examples

- 123456789012345678901

## Related Fields

The postal code makes the delivery destination machine-readable for routing, logistics, and matching.

- [BT-75 Deliver to address line 1](/resources/xrechnung/bt-75-deliver-to-address-line-1)
- [BT-77 Deliver to city](/resources/xrechnung/bt-77-deliver-to-city)
- [BT-80 Deliver to country code](/resources/xrechnung/bt-80-deliver-to-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-78

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
20 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:Delivery/cac:DeliveryLocation/cac:Address/cbc:PostalZone
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeDelivery/ram:ShipToTradeParty/ram:PostalTradeAddress/ram:PostcodeCode
```

## Why the standard cares about this field

### Business Context
The postal code makes the delivery destination machine-readable for routing, logistics, and 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)