[rules-users] cross products in excel decision tables

I need to model something similar to "when the lastname on a passport does not match the lastname on the application" in a decision table. Written in DRL: rule "PassportValidation_24" when $a : Application() $p : Passport(application == $a, lastName != $a.lastName) then $p.setError("Passport's last name (" + $p.getLastName() + ") does not match with application's last name (" + $a.getLastName() + ")"); end How do I do such a cross referencing in an Excel decision table? Tom