Grossing Up

We have to implement a tax scenario in Thailand whereby business has to pay entire amount to supplier for which they invoiced for and in addition business pay extra amount of withholding tax on supplier behalf to tax authority. This scenario is called Grossing up in Thailand.

Please let us know how we can achieve this scenario in Oracle? 

Example-

Gross up withholding tax in Payables

Standard functionality (not grossed up) is:
Invoice Amount 1200 (200 is VAT inclusive)
DR Expense 1000
DR Recoverable GST 200
CR WHT Liability 100
CR Supplier Liability 1100 - actual payment

Standard functionality means that in the above scenario, the supplier would receive 1100.