Allow for the separate entry of invoice tax, gross and net amounts

Sometimes, there is a discrepancy on the amount of sales tax (VAT) to be applied between the original PO and the invoice that is received. For example, the PO may have a single line item with a single tax rate while the invoice may have different tax rates on different line items.

Can the system allow for the actual tax, gross and net rate be added at the point the invoice is added to the system?