Error Id 0949 Currency Exchange Rate Not Found and id 79 Invalid parameters

Hi ,
I have two errors in P03B2002 / W03B2002A. When I put some particular customers in my inquiry the system has 2 errors:

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The customer are all from France and Belgium, with the currency Eur that is the same of our system( we are a italian enterprise). Anyone can advise me for fix this problem?
thank you very much for the disponibility,
Bye
 
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