System message - Base document exchange rate cannot be used

Hi!
I need an Information ... when I use the function "Copy From" i get the Draft Document Wizard where i set "Use Exchange Rate from Base Document." But when I select "Finish" I get the following system message: "Basic Document Exchange rates can not be used, the rows will be updated using the exchange rate target document.
Why??

Hi
at the sales front
the exchange rate should be always as per the Posting date this is standard, how ever if you wish you can manually overwrite the defined exchange rate
at the purchase side you define the system wether you want the exchange rate to be from based document or as per the posting date in choose  Administration -  System Initialization - Document Settings -> Exchange rate base date (A/P documents)
hope i made my point
sandeep

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