Users who have the the Read/Write/Undo access type can undo any of the following operations:

• Create Contract
• Rollover
• Netting
• Partially Close
• Close

Undo in an operation has the following effects:

• All contracts closed by the undone operation will be reopened in the state it was before the operation
• If a contract was created by the undone operation that contract will be cancelled
• If a transaction was completed by the undone operation that transaction will be reopened

This is done by right clicking a contract that was affected (created or closed) by the operation and selecting "Undo" from the context menu.

You will be informed what effects undoing the operation will have before you confirm.

Note that operation that created a contract that since has been the target of another operation cannot be undone until the later has been undone.