Curreny Problem in F-53

Hello All
I Have Booked One JV as under.through F-43  Exchange Rate is 42.0325 EUR to THB.
Vendor Account Cr P.K 39     400 EUR  Local Currency Amt is 16813/- ( THB )
Vendor Account Dr P.K 29 A 400 EUR  Local Currency Amt is 16813/- ( THB).
Now i am going to make payment through F-53 in local currency.(THB )
When i click process on open item system shows me 16580/-  instead of 16813/- i am not getting that why this amount is come.
There is one I-con which name is ''currency'' when i click that then system shows me 16813/-. i wonder from where system pick 16580/- .
When i simulate the Transaction System Show me Amount 16813/- In Local Currency and 16580/- in Document Currency.
I wonder that how i can system show me different amount for same currency
Manoj J

Your payment date might be different as this reason exchange rate aslo different, that is why system showing a different amount in F-53.
This is the normal behaviour of SAP system.
remianing difference will go to realized forex gain/loss accounts.
but you should complete your configuration in OB09.
Rgds
Murali. N

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