required=True,help='Message subtype, gives a more precise type on the message, especially for system notifications. For example, it can be a notification related to a new record (New), or to a stage change in a process (Stage change). Message subtypes allow to precisely tune the notifications the user want to receive on its wall.'),
'default':fields.boolean('Default',help="When subscribing to the document, users will receive by default messages related to this subtype unless they uncheck this subtype"),