Exchange rate not updated with posting date, translation date updated

Hi,

I have the follwoing problem in F110. Currency documents are posted with exchange date of the docuemnt entry date. Translation date is updated with Posting date, just exchange rate is not updated. the systems calculates according entry date. Why entry date is one day before the date of posting, I cannot understand. The system takes the exchage date from entry date, which is one day before (docuemnt, posting and translation date)

Thank you,

Desimira