Tax Category selection in Purchase Order

Hello,

During Purchase Order creation, the tax category can be changed manually by the requester. As a result, requesters may incorrectly select an "Across State Tax Category" even when the supplier and buyer belong to the same state. Currently, the ERP system does not display any validation error for such incorrect selections.

1) If the supplier and buyer are located in the same state, the system should display and allow selection only from "Within State Tax Categories".
2) If the supplier and buyer are located in different states, the system should display and allow selection only from "Across State Tax Categories".