Overwrite WithHolding Tax at Supplier Invoice

Dear SAP Business ByDesign Experts,

WHT is calculated automatically in the system. But we strongly like to overwrite it. For our customer in Egypt, it couldn’t be calculated systematically as authorities follow complex pricing in their internal system.

So, the bottom line, can we overwrite WHT as it is possible to overwrite VAT while creating supplier invoice?

Thanks & Regards,

Amr Abdelhaleem