Been in a predicament in ServiceNow, where you know the person a task needs to be assigned to, but don't know the right group? I got you!
In this video, we add an advanced reference qualifier on a dictionary override on the assignment group fields (for incidents) that calls a server side script include to run some funky glideRecord queries and return as back a refined list of group sys_id's. Its then these groups that are shown when you click the Assignment Group magnifying glass.
https://docs.servicenow.com/en-US/bun...
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