Dear Pak Rene
I already ask Indonesia about exchange rate. Brief as below
1. Person in charge to update exchange rate in SAP is GL in Accounting
2. Update all currency by daily with T.Code S_BCE_68000174
3. All section that related with Import/Export they will use exchange rate from SAP such as record AP / AR / EXPORT / FOREX / Purchase etc… (auto from SAP)
4. End of every month running forex by T.Code F.05