Invoice selecting PO rate instead of invoice rate

Good afternoon,

I was investigating an issue on a invoice matched to a PO for one of our entity and I found out that the rate that is being selected when we do the create accounting is the rate of the PO instead of the invoice rate. Since we have a secondary ledger for this entity we have a large GAP between the PL balance and the SL balance because the accounted rate for the Secondary ledger takes the invoice rate.

Which means that right now, when we enter an invoice matched to a PO, the invoice workbench indicates the rate of the invoice date (since we use the invoice date as GL date), but when we do the accounting, the rate selected for PL is the rate of the PO, but the rate of the SL is the rate of the invoice date and we use monthly rates.