Reconciliation is the process of correlating an event with another event. For example, you send a document file to a partner containing transactions such as payments or orders that require acknowledgement. When you send the file to the partner, you initiate a reconciliation. When you receive the acknowledgement from the partner, you complete the reconciliation. The Data Exchange Server uses a correlation ID to identify each transaction and to reconcile the event associated with sending the file with the event associated with receiving the file.