Excise value calculation of Assessable Value in Purchase Order

Hi Friends,

In a requirement, we need to calculate Excise on Assessable value maintained in J1ID transaction. We are getting excise calculated values on Net value, whereas as per requirement we need to have it on assessable value. Is there any functionality available in SAP standard system for calculating it on assessable value. We have found the same for Sales scenario, pls suggest us for purchase also.

Rgds, Krishan Raheaj