You can keep a record of all the changes made to transactions. Such a record is called an audit trail.
If you keep an audit trail, you may find that QuickBooks works a little more slowly, and your data will take up more disk space. These changes occur because QuickBooks must keep a record of every transaction change. (Normally, QuickBooks writes over a transaction when you change it.)
Transactions that say “Previous Transaction” have been modified. You can compare a “previous” transaction against the “current” one to see what has changed. The report also shows the date and time of each modification.
Audit trail information increases the size of your company data file. You can remove audit trail information by selecting “All audit trail info” when you use the Condense Data command to reduce the size of the file. If you have never used the Condense Data command before, we suggest that you read How QuickBooks condenses data first.