# BT-132 Referenced purchase order line identifier

An identifier for a referenced line within a purchase order.

## Quick answer

An identifier for a referenced line within a purchase order.

> **Line items**: The goods or services on each invoice line, including quantities, prices, and VAT.

## In plain language

An identifier for a referenced line within a purchase order.

An identifier for a referenced line within a purchase order.

Links the invoice line to the specific line in the purchase order.

## What you usually enter here

Alphanumeric identifier

Typical valid values include: 1, 5, 10, PO-LINE-001

Optional but recommended for automated matching and reconciliation.

## What goes wrong often

Avoid values like: , line

Relevant rule codes: BR-2

## Examples in context

Links the invoice line to the specific line in the purchase order.

Optional but recommended for automated matching and reconciliation.

## Valid Examples

- 1
- 5
- 10
- PO-LINE-001

## Invalid Examples

- line

## Related Fields

Links the invoice line to the specific line in the purchase order.

- [BT-126 Invoice line identifier](/resources/xrechnung/bt-126-invoice-line-identifier)
- [BT-13 Purchase Order Reference](/resources/xrechnung/bt-13-purchase-order-reference)

## 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-132

### Data Type:
identifier

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
50 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:OrderLineReference/cbc:LineID
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:ReferencedDocumentLineDocument/ram:LineID
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Links the invoice line to the specific line in the purchase order.

### Legal Requirement
Optional but recommended for automated matching and reconciliation.

## 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)