Message F5063 - Ex.rate diff.accts are incomplete for account & currency &

Hi Friends,

I am using F-53 transaction and I got the error message "Ex.rate diff.accts are incomplete for account & currency &" - number F5063.

I believe that I can figure it out using OBA1....but I saw that the GL account is already set up in KDF transaction (Exchange Rate Dif.: Open Items/GL Acct).....

Does someone know how can I solve it?

Thanks

Daniel Dorta