I have two fields (Hire Date and Termination Date) that I would like to use in the Select Expert. The goal is to display all Hire Dates before 2008 where the Termination Date is null. I have tried several variations of the following to no avail:

({PA_STUDENT.HIRE_DTE} < DateTime (2008, 01, 01, 00, 00, 00) and IsNull({PA_STUDENT.TERM_DTE}))

Unfortunately, this does not return any data. Any help that you could provide would be greatly appreciated.