The Transaction Records is valuable tool for audit purposes. Many edits to the matter are written to the transaction table for review. Some of the transactions that are stored are edits to the matter, documents that were added, invoices that were added, either manually or uploaded via LEDES file etc.
To view the transactions on a matter, open the matter and select the Transaction Records tab. You can view the details for a transaction by clicking the date\time hyperlink of the the record to view details on the transaction, who performed it and when.