In PeopleTools Application Designer, click Open on File menu. The Open Object dialog box appears.
Click Message from the Object Type list. This displays all available PeopleSoft message definitions.
Double-click the message definition. The Message window appears, displaying the record details of the chosen message structure.
Click Object Properties on the File menu,. The Message Properties dialog box appears.
Click the Use tab.
Select the Active option and click OK.
Save your current changes. You have now activated the message definition for publishing or subscribing.