NO_UPDATE_ALLOWED is system defined toggle that indicates if the value of this field may be changed.  When toggled ON, this indicates that the value of the record may not be changed again after the record has been initially created (a [referential integrity|REFERENTIAL INTEGRITY] constraint).


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![Notes|Edit:Internal.NO_UPDATE_ALLOWED] 	
[{InsertPage page='Internal.NO_UPDATE_ALLOWED' default='Click to create a new notes page'}]