If Description = XYZ, Display XYZ

Hi All! Looking for some assistance to what I thought was simple as we've done it before, but just receiving the invalid expression pop up.. We want the custom field to say.. If "Task Description" = SL1, Display, "Project.SL1" (Project.SL1 is copying the data from project level) Trying, IF({Description}="SL1", "Project.SL1") IF({description} = "SL1", CONCAT({Project.SL1}, "") & have tried using the task level calculated fields for this, but that's not working either (CONCAT(Project.SL1))... Any ideas?? Thank you! Jordan Martinson LeaseTeam, Inc.