defining a fetch spec in modeler that lists objects with related to many records

jesus Guzman <[email protected]>
Newsgroups gmane.comp.web.webobjects.devel
Message-ID <[email protected]>
I would like to create a fetch spec that lists records that have/dont  
have related many records

that is salesman without sales, or with sales, etc....

for related ones its easy the linked field null or not null, but the  
other way around is not easy
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