(u) variable is not working when trying to insert in an Event

Document ID : KB000095223
Last Modified Date : 21/06/2018
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Issue:
{u} variable is not working when trying to insert into an Event.
All of the other options seem to work fine.
Environment:
10.2.3
Resolution:
The {u} variable cannot be added to out of the box Events such as 0x110a03 and 0x110a04.
This is due to coding for those events is not present. 
You can find more information on Events and Variables at 
https://docops.ca.com/ca-spectrum/10-2-3/en/managing-network/event-configuration/working-with-events-and-alarms