Foreign Trade Data

Hi,

for foreign customer what foreign trade data has to be maintained

because in material master I maintained Comm./imp. code no.,Ctry of origin, Dispatch ctry,

Region of origi, Export procedur ,BusTransactType

as well same data I maintained in invoice under foreign trade data view

but still I am getting messsage that " Foreign trade is missing"

what other data I need to maintain?

Regards,

Rahul