# Order change

## Introduction

Order change is a document in the [advanced ordering process](index.md#advanced-ordering).

The order change document facilitates a more fine grained control over the ordering process and is used by buyers to request changes to a purchase order they previously submitted. The order change may also be used by buyers to confirm their acceptance of changes to purchase orders made by the sellers.

Order change documents are important for ensuring that the final order is accurate.

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## Recommended formats

Below is a list of order change formats recommended by us.

!!!success Note
All formats recommended by us are actively maintained, based on open standards, offer good supporting documentation and validation artefacts.
!!!

#### Peppol BIS Order Change 3.0

Peppol **B**usiness **I**nteroperability **S**pecifications (BIS) are technical specifications that can be implemented in existing eProcurement solutions and eBusiness exchange services to make them interoperable between disparate systems.

Peppol BIS defines a set of information elements (business terms) and business rules to ensure that requirements are fulfilled and to clarify any option that would otherwise be left open to implementers to decide on.

They are [developed and maintained by OpenPeppol](https://peppol.eu/) and are one of the most commonly used open standards today.

[!ref Specification](https://docs.peppol.eu/poacc/upgrade-3)
[!file text="Example files"](https://docs.peppol.eu/poacc/upgrade-3/files/PEPPOLBIS-Examples.zip)

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#### EHF Order Change 3.0

**E**lektronisk **H**andels**F**ormat (EHF) are format specifications developed by the Norwegian Agency for Public and Financial Management (DFØ) for the Norwegian market.

[!ref Specification](https://anskaffelser.dev/postaward/g3/spec/current/advanced-ordering-3.0/)
[!file text="Example files"](https://github.com/pagero/integration-resources/tree/main/example-files/order-change/EHF%20Order%20Change%203.0)

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## Customer specific formats

We can build support for any proprietary/closed source format you and your ERP system may require.

For more information, please see the [proprietary or closed source formats section](../index.md#proprietary-or-closed-source).