you have to use a group condition in the group select to make it include or exclude the whole group
in this case the group is a client
your condition is that you want clients with only a primary insurance
if you insert a summary of the insurance type at the client group level you can use the to find what you want.
Minimum(insurancetype,client)
any clinet group that has the value of 4981 meets your condition
use that in the group select
Minimum(insurancetype,client)=4981
Edited by DBlank - 08 Aug 2013 at 7:29am