Discount after tax in TAXINJ

Hai

My requirement is in TAXINJ procedure my client want discount to be reflected in PO like this.

Base value 1000

BED 14% 140

cess3% 4.2

Discount 2% -20 (this on base value but subtracted after tax)

subtotal 1124.20

Vat 4% 44.96 on subtotal

Total 1169.68

Discount has to be calculated after Tax I have assigned subtotal 6 for the discount condition type and AltCBV as 363 for vat condition type in TAXINJ procedure still I am not able to achieve the final value

Kindly advice how too proceed.

Regards

R.Senthil