Inv. MSRP from V/S Work sheet should always pulls the number from the manufacturer invoice and the number should never change even if price increases are applied

If we go in any worksheet and we click on sales amount to see the MSRP, we see two fields for MSRP. Inv. MSRP and MSRP both numbers tend to be exactly the same which is the ideal case. But there are cases where there was a price increase and this will be reflected in the new MSRP but the Inv. MSRP would be identical to the new MSRP which is wrong as banks will only fund the deal if we input the right invoice MSRP. So the change I would like to see is that Inv. MSRP always pulls the number from the manufacturer invoice and with that the number should never change even if price increases are applied.