Additional tax amount field needed for tax reporting

We are setting up a new company which is based in Singapore(SGD).  However, the domestic currency will be setup as USD.

 

When local SGD suppliers bill in USD, they will also provide the SGD equivalent of the tax amount.
Noted when entering a domestic voucher in P0411, there is no option to capture the SGD tax amount.
This SGD tax amount is important for local government tax reporting.

Would like to know how we can handle this in E1 and how other client is handling this situation.   Thank you.

Rgds

SK