Tax Lines Do Not Get Cancelled When The Tax Are Changed If The Invoice Is Matched To A PO

Hi Experts,
Good Day!!!

We would like to clarify the following point from a standard Oracle perspective:

Scenario:

We have a purchase order (PO)-matched invoice. At the PO level, the tax rate selected was Standard NR. In AP Invoice, the user removed the Standard NR tax rate at the invoice line level and replaced it with the Exempt tax rate. Consequently, tax was calculated at the Exempt rate.

However, the Standard NR tax rate is still appearing at the AP invoice line level and in the tax details form. Additionally, it has not been canceled in the tax details form.