iFlow Condition Editor

I have a situation where I need to determine the receiver for an interface based on the existence of a node.  This works fantastic using the condition logic (EXISTS(Xpath./p1:EmployeeNotification/p2:BankingInfo).  My issue comes with the opposing argument where I would like (NOT(EXISTS(Xpath./p1:EmployeeNotification/p2:BankingInfo)).

I am currently working on 7.31 ehp1 SP05 and would like to know if there is a work around or if a later SP exposes additional XPATH operators.

Thanks,

Andrew