Action Item Email Message customization

Document ID : KB000100407
Last Modified Date : 30/11/2018
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We need to modify the email message generated from the Action Item attached to the Process. We looked around and tried to modify some of them which we found related to Action Items but it does not update the email message but updates the Action Item details (where you land after clicking the email link). Is there way to modify the email message in the Action Item email generated from Process? If yes, which Notification we should update?
It is possible by navigating to Administration->Notification and selecting notification below
Notification Name = Action Item - New non-recurring project action item
Description          = New non-recurring, project action item

Note Notification Name: Action Item (Process) - New action item is the one used for non project based object, for example you can use for custom object or non project object. For project object Action Items use notification mentioned above such as Description = New non-recurring, project action item.

We discovered that it is not working in 15.2 where updates you made in the body and/or subject are not reflecting but it is working in 15.3 and 15.4