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Help Desk Ticket Reference: https://c.na7.visual.force.com/apex/Case_View?id=500A0000005ib7x&sfdc.override=1 securitylevel_name: Public Currently the way to do this is by using formula or free form drl. I know that Guided Editor is a Business Analyst tool, so "is null" and "is not null" may not be the right words. Maybe "exists" and "not exists" is better (or a different sentence), but it is important to analyst has a option related to this in drop-down box.
Link: Added: This issue related GUVNOR-1172
Definitely "exists" and "not exists" is not a great choice, because can be confused with "exists" drools keyword.
Committed to 5.1.x branch