Hi - a group admin for a smaller agency asked if I could do a report that shows projects that have no predecessors on them. This was a little more complicated than I thought due to the structure of the info on the backend, so I thought I'd share in case this comes up for anyone else.
EXISTS:1:$$EXISTSMOD=NOTEXISTS
EXISTS:1:$$OBJCODE=PRED
EXISTS:1:predecessor:projectID=FIELD:ID
(The part that threw me is that the reference of a predecessor is also called a predecessor when really it is just the task itself. Very weird. Thank god for the API Explorer 😎 )