Cannot create AR Invoice negative amount with WithHolding Tax negative amount via DI API

Hi All,

I tried to create AR Invoice Document via DI API, but with negative amount and negative withholding tax amount.

Document added successfully, but when i open the document in SAP, and i open WTax Table information, withholding tax amount become zero,

Please see image below.

But when i add the same document through SAP Screen, i can fill WTax Amount with negative amount.

SAP Version 9.0 PL 5

Please kindly help,

Thanks

Best Regards

Siddharta