Functional module for determining the sales tax code

Dear all,

Kindly help me is there any Functional module to determine the sales tax code?

My Requirement is Based on the Country, Sales Org and Tax code Pricing should pick up automatically.

I tried adding the same fields in the table and inserted in the access sequence and created the condition record for the same.

Created the order but system is not able to get the Tax code while determining the price?

Please help ...

Regards,