How to make the "Product Fiscal Classification" field inherit the value of the category that was ****

Content

I have some Manual entries in Accounts Payable
And when entering the Item Code, I need the "Product Fiscal Classification" field to inherit the value of the category that was associated with the Item.
This is to calculate some specific tax withholdings.
This same field when creating a PO, this field, "Product FIscal Classification", and populates automatically when placing the Item on the PO Line

but this does not work the same way when I inform that item in a line of an Invoice entered Manually in Accounts Payable, this attribute is empty.
For Invoices with Match with PO this field is populated as expected