Changing Pricing condition-JCV1

Hi all

i want to change the following conditon in PO ( relevant part) where in the > CVD is calculated wrong. ( 16% of Basic customs duty). ( CVD ought to be > 16% of material cost + basic customs duty).

i have specified in IMG schema condition to calculate from Material price,but how can i "add" the basic custom duty here

can anyone give me suggestion

regards

Ansuman