"3. For the Reverse batch entries? checkbox, turn that option on if you wish to reverse the posting batch entries. This creates a reversal of the debits and credits in the transactions posted. If you leave this checkbox off, instead of reversing the posted debits and credits that occurred during posting, they will simply be removed.
The default is to leave this option off. This is advisable if you've simply posted a batch that you didn't intend to post before making some final changes to that batch. If you actually want to retain the original posting entries and create the reversing entries, then you would turn this option off."
Should not that last word be "on"?