Hi,
Foreign exchange revaluation is done only in case of Open Items.
In this case we want to clear vendor. Hence no need to do revaluation, hence no exchange rate maintenance through OB08. In addition to it please ask users to use transaction code S_BCE_68000174 (Path - SAP Easy Access --> Accounting --> Financial Accounting --> General Ledger --> Environment --> Current Settings --> S_BCE_68000174 - Enter Translation Rates) instead of OB08.
Yes, we can use transaction code F-53 to clear vendor. But this transaction has restriction i.e. only in case we are paying through bank we can use this transaction and if he want to pay (clear) vendor other than bank F-30 transaction proves to be very useful.
I hope everyone's doubts are clear if not please feel free to revert.
Regards,
Tejas