I have edited and deleted the Alarm Message, however, it is not reflected on GP unit.
1.
Transfer the project file to GP unit again.
When transferring, select [Transfer]-> [Setup]->[Transfer Settings], and put check marks on [GP System Screen] and [Send All Screens].
2.
If the problem is not solved yet, execute [Rebuilt]and change to [Force System Setup] in [Transfer Settings], and transfer the screen data to GP unit again.