Re-trigger of Tag Notifications from PCo to MII

Hi Experts,

I have configured Tag Notifications in PCo version 15.0.0.1959. The tags are of BOOLEAN type with values either 0 or 1. I want the PCo to trigger notification messages only when Tag Value changes from 0 to 1 or from 1 to 0. For most of the tags, the process works fine. However, for certain tags the notifications get triggered twice for example:

If tag value is 1, a notification is received

If tag value is 1, another notification is received.

Is there any way I can eliminate duplication of notifications in PCo? Do I need to change any time related settings in PCo?

Thanks,

Rajeev