Change Operation is an instruction on addition, replacement or deletion of elements within an Order.
XML Example
<Notification>
<ChangeGroup xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
<ChangeOperationGroup>
<ChangeOperation>
<ChangeDateTime>2025-07-31T11:15:16.000576</ChangeDateTime>
<ChangeTypeCode>2</ChangeTypeCode>
<New>
<DataLists>
...
</DataLists>
<Order>
...
</Order>
</New>
<Old>
<DataLists>
...
</DataLists>
<Order>
...
</Order>
</Old>
<ReasonCode>100</ReasonCode>
</ChangeOperation>
<OrderVersionNumber>2</OrderVersionNumber>
</ChangeOperationGroup>
</ChangeGroup>
</Notification>