How to default Tax Classification and WHT Code from PO & PR DFF?

The Tax Classification and WHT Code defaulting from Item and Item Category could not fulfill our client requirements as a single item can have different Tax and WHT in different situations. Thus, they need to define Tax and WHT at PR and PO.

If we create Descriptive Flex fields at purchase requisition lines and purchase order line to contain Tax Classification and WHT Code, is there any way to setup Tax and WHT to be defaulted from PR and PO DFF after invoice matching?

Version (include the version you are using, if applicable):

Oracle Fusion Cloud Applications 23B (11.13.23.04.0)