One of the top customer requests for many years from sites that use foreign currency - currently you cannot specify cost centre/depts. in the nominal defaults/tax codes and exchange rate settings. two aspects - 1/ a journal has to be posted to the correct account with the cost centre/dept and 2/ for customers that have default cost centre/depts. set on sales and purchase ledger accounts they end up with lots of postings going to suspense as they do not want to setup every combination of cc & dept for the exchange gains and losses account.