Hi Bhagyesh,
Your client want to convert the USD,YEN to LKR, menace LKR is your reporting currency then you need to maintain LKR in reporting currency and properties should be REPORTING " Y" and CURRENCY_TYPE - "R" for reporting.You should also mentioned LC in your reporting currency and currency type L,which indicate all your default transaction currency which are converted to reporting.In Reporting currency there is no need to maintain USD,YEN,EURO if you don't want reporting in those currencies.You mentioned this currency already in your entity dimension currency properties.
Khokan