Issue with currency quotation method because the method applies for the whole instance instread of S

we are a multinational and have implementation in various countries. All this countries have their own local regulations therefor a couple of countriies import their own market rates. You can set up a market rate per SETID,( per country) but NOT the currency quotation method. We are using the currency quotation method  because for the EURO countries because for this countries we use triangulation.  For non euro countries we do not use triangulation.  However when you set up the currency quotation method ( no triangulation)  for US  as follows : " from  GBP to US" direct you will have an