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updatedAt: 2026-07-22T19:37:13.000Z
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# Austria (B2G): Contract Reference

Configure the Contract Reference for your Austria documents.

# Elements

For Austrian B2G invoices, this is the BBG contract reference.

The BBG is the Austrian Public Procurement Agency and issues this number.

| Name (Path)                                               | Cardinality | Description                                                                       |
| :-------------------------------------------------------- | :---------- | :-------------------------------------------------------------------------------- |
| Contract Reference (`/Invoice/ContractDocumentReference`) | 0..1        | A group of elements providing information regarding a related Contract Reference. |

This group contains the following elements:

| Name (Path)                     | Cardinality | Description                                                |
| :------------------------------ | :---------- | :--------------------------------------------------------- |
| Contract ID (`ID`)              | 1..1        | The identification of the Contract the invoice relates to. |
| Scheme Identifier (`@schemeID`) | 1..1        | Scheme identifier.                                         |

Use the following scheme identifier attribute to indicate the BBG number.

| @schemeID        | Element                       |
| :--------------- | :---------------------------- |
| `VRBL:AT:BBG-GZ` | BBG contract reference number |

# Example

The following example includes a contract reference.

```xml
<Invoice>
    <!-- code omitted for clarity -->
    <cac:ContractDocumentReference>
        <cbc:ID schemeID="VRBL:AT:BBG-GZ">CD-11223344</cbc:ID>
    </cac:ContractDocumentReference>    
    <!-- code omitted for clarity -->
</Invoice>
```