Cost Estimate with Quantity Structure displays international freight and Duty

Dear friends,

In t.code CK13N-Display Cost Estimate with Quantity Structure , it is displaying  adding International Freight and Duty , which the idiosyncratic is saying , it is not correct. We are successful ECC 6.0

How to resoluteness the issue. Please suggest with t.codes and wherever to cheque to resoluteness the issue.

Regards
Sridhar