Override tokens problem

The idea is to have a centralized notification program for internal notifications. Tokens are used in the content for the mail. ( e.g. the subject for the notification )

I have defined a token at the highest level :  {{my.Notification_Title}}

A certain operational program overrides the value for that token , when the operational program is triggered,  a smart campaign in my centralized notification program is called. I was expecting the "local" updated {{my.Notification_Title}} to appear in the mail sent, but i see the default value from the definition at the highest level.

What am i doing wrong here?