service tax base amount for calculation : to be changed
i have and PO order with basic price say for 100 /- on which it is calcuating service tax 12% , e-cess 2% hcess--1 .This is coming thru tax code from the tax procedure and these taxes service/ecess /Hecess is to be posted to sepearte G/L account.This is working fine.
Now my requirement is that i want to calculate service tax on some % of the base price say 70 % of the base price. The % will always be changing .i want to calculate service tax on the 70/- not on 100.
i want that system should post this 100 /- to cost of service but the tax should be on whatever percentage i make .Here this is 12.36 % on 70 not on 100 at the time of invoice posting.
please guide me