Wrong tax rate area in stock purchase order

Hi Team,

There's a scenario where user generated a stock purchase order from a stock requisition but the wrong tax rate area along with tax explanation code got populated in purchase order. The supplier , entered initially in the OR , was changed by user to the correct value through P4310 after printing the OR. However , the tax rate area which got populated in the OP/S order after releasing the OR belongs to the initially entered supplier.

The OP/S order has been received in inventory and MATC 1 entries are generated in F43121. Now , due to some business scenario , user cannot revert the receipt entry but still wishes to get the tax rate area corrected in the purchase order.