VAT Settlement without using Localisation

Hi,

we are doing an implementation in Sri Lanka. Like other countries here also VAT is in praqctice and follow the same rule as India. Output VAT (Collecting from customers through Tax Invoice) can be adjusted against Input VAT (Paying to the suppliers at the time of purchase) and net amount is being paid to the Tax Authority. For Indian implementations this can be taken care of by India Localisation. How to take care of this in a Sri Lankan implementation without using Localisation.

Regards

JAYASHIS