Lawson Security Reports

I am trying to run an attribute report in Lawson Security that needs to include criteria for an attribute(Role) that is blank. I cannot seem to come up with a criteria within Lawson Security reports that will allow me to exclude users with their "role" attribute blank. I am trying to create a  query that will allow me to update just the users with a particular "portal role" but their 'role' cannot be 'blank'. I am using the 'is not' function within the report. Any help is appreciated.