Use the Undo command from the Edit menu to undo your last action.
You can repeat the Undo command to step back and undo previous actions. There is no numerical limit to the number of previous actions that you can undo. However, you cannot undo actions past the point at which the report was last opened.
Use the Redo command, described later in this section, to redo previous actions that you have undone by using the Undo command.
To undo the last action
Select the Undo command from the Edit menu
Press Alt+BKSP
Click the Undo toolbar button
Right-click in the Script Code pane and select Undo from the menu that is then displayed
Your previous action is then undone.