Undo changes when adding or editing records in Datasheet or Form view

• Click Undo on the toolbar to take back your most recent change.
  
  
• Click Undo Saved Record on the Edit menu if you have already saved changes to the current record, or have moved to another record.

As soon as you begin editing another record, apply or remove a filter, or switch to another window, you can't use these methods for correcting changes.