Foreign exchange transaction

Hello,

This is not a SAP technical question but a business process issue. We have to maintain exchange rates for September on 1st Sept. Unfortunately, 1st Sept is a public holiday in UK. The new exchange rates would be available only on 1st September and there would be automatic transactions (like orders being received, invoices being received electronically and posted in FI) happening on 1st of September.

Could anyone advise what are the best practices for maintaining this? The only solution that I think is someone needs to work on a bank holiday to key in the exchange rates.

Any advise would be very helpful.

Thanks