Withholding tax calculation based on E-Biz tax generated on an Invoice

Hi All,

Currently the AWT is calculated on the basis of

1. Invoice amount range

2. Period range etc.

But these calculations consider the "Invoice Gross Amount" for calculation of AWT amount.

Can we somehow achieve calculating AWT amount on the basis of E-Biz tax amount generated on an Invoice instead of Invoice amount?

If not in Withholding Tax definitions, how can we attain this?

We are in need of generating AWT amounts dynamically.

Regards,

Prasad