ASPRunner 5.2 issue with NZ function

I am trying to write an ASPRunner front end for an Access query. Some of the query fields use the nz function like:

Binding1_Subtotal: Nz([Binding1_Qty],0)*Nz([Binding1_UnitPrice],0)

This works exactly as intended when viewing the query in Access but ASPRunner 5.2 will not load the query with the nz function. Plase advise. Thanks in advance