ReceiverDetermination, Condition Editor

Hello,

In Receiver Determination I have one mandatory receiver and the second one which should receive messages only if the particular attribute DOESN'T exists.

I was trying to use the count(/some/@attribute)=0 but it is not working (in trace I see, that if it can't find the attribute it immeadeatly gives false to the rule without calling the count function).

So is it possible to do this with standart Receiver Determination?

Best Regards,

Artsiom Anichenka