How to not show specific fields with X value.

I created a simple report in HPE Service Manager to show specific requests assigned to me that are open and are part of a project.

open=true and assigned.to=$lo.user.name and project.id="REP99"

How to I change it to show everything but requests with project.id "REP99"

I tried:

open=true and assigned.to=$lo.user.name and project.id<>"REP99"

but it shows me nothing then.