In BC Standard there is no way to set this up.
In many tables, like the customer or vendor ledger entries you'll find fields like Amount [which means this the amount in transaction currency / foreign currency ... if a currency code has been entered] and Amount (LCY) ... here we don't show "Amount (MYR) [in your case] but always the generic ... "Amount (LCY)".
If you want to chenage that a customization would be needed
