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Entering a Notification Header Text 

In the standard notification types, the Description field is located on the following tab pages:
A word processing screen appears.

If you specified that a long text may not be changed for a notification type in Customizing for Notification Types, you cannot change a previously entered long text when you change a notification. However, you can enter a new text in a new block at the end of the existing long text.
In Customizing for Notification Types, you can also specify that the system should record the user name and date with any long text changes.
