# BT-132 Referenced purchase order line identifier

An identifier for a referenced line within a purchase order.

> BT-132 (Referenced purchase order line identifier) points a single invoice line back to the specific purchase order line it fulfils, carried in cac:OrderLineReference/cbc:LineID within BG-25. Optional under EN 16931, but valuable for automated line-level order matching in accounts payable. Example: 5.
>
> BT-132 · EN 16931 / XRechnung 3.x

## BT Reference Card

Key EN 16931 and XRechnung facts for this business term.

- **BT code**: BT-132
- **Name**: Referenced purchase order line identifier
- **Cardinality**: Optional (O)
- **Business group**: BG-25 INVOICE LINE
- **Data type**: Identifier
- **Example value**: 5

## 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.

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-132)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-132)

## 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

## 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
```

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

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

## FAQ

### When should I provide the Referenced purchase order line identifier (BT-132)?
Provide BT-132 when the buyer requires line-level PO matching, so each invoice line points back to a specific purchase order line. It is meaningful only when the order reference BT-13 is present at document level; without BT-13 there is no order for the line to reference.

### What format does BT-132 use and how does it relate to BT-13?
BT-132 is a free-text line identifier (the order line number) matching how the buyer numbered lines on the purchase order referenced by BT-13. There is no fixed pattern in EN 16931, but the value must correspond to a real line in that order so the buyer can reconcile it.

## 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)