How do you apply a' NOT' filter to FortiAnalyzer log queries?

Hi guys, I' ve got a FA running 5.0.3 here and have been trying to figure out a way of applying a NOT filter to the log view. For example, I' d like to look at the logs where scrip != 192.168.1.1 but none of the filters seem to work (using NOT, ! etc) seems to work! Has anyone had any luck with this?