Using curent user Workgroup in generic inquiries filters

Hey !

I currently face difficulty with filtrering query results  :

I often need to restrict the documents visible for user (ie Invoices or P.O.) I use the @me parameter but I also need to keep the abaility for the general accounting users to see all the lines without restriction (They may not be the creator, last modificator or owner). 

Is the a way to pass the workgroupID of the curent user in parameter  or an other way to escap filtrering with condition of the curent user ? 

Thanks for your help.

Cécile