In the Lifecycles main window, display the list of lifecycles in the content pane by clicking the top node: 
in the navigation pane.
Click the name link of the lifecycle in the content pane. The Edit Lifecycle dialog box appears.
Select the state for which you want to delete the rule in the Lifecycle Model.
Select the attribute/rule row(s) you want to delete in the Attribute Rules area and click the Delete button: 
. You will be prompted with a dialog box asking you to confirm the deletion.
Click Yes to delete the attribute rule(s).