TAX account

what should be an AR tax code's natrual account - asset / liability

Outgoing tax that u charge and take from your customer is a liability as u have to pay back to tax authority.

So it should be a liability account.

Oracle Applications Fusion Cloud - Inventory

Oracle Cloud/Fusion Manufacturing Cloud training will help you develop the fundamental skills required to set up and use the Manufacturing module. This training covers all the tasks, setups, forms and reports used in Manufacturing and related modules