[rules-users] Adding two numbers

I have two properties on my class that I'd like to add together and compare results. I'm trying: when stub:PaymentStub(daysJuror + daysPanel > 0) But this throws an error. Either daysJuror or daysPanel work, but adding them together doesn't. Isn't there a way to do this? Thanks! Thom Hehl Java Applications Architect Public Safety & Justice Affiliated Computer Services, Inc. A Xerox Company 1733 Harrodsburg Road Lexington, KY 40504-3617 Tel 859.277.8800 x 144 Fax 859.277.2300