GL Balances running in FX Valuation

Hi Team,

I have an GL account with Account currency as "AUD" ( where as company code currency is USD)

This GL account has an account balance in AUD 2010 and end of the year balance got tied finally no balance to carry forward..

In 2011 the same account showing blank for all periods in FS10N in AUD, when i check in USD, every month posted certain amount for revaluation Debit and reversal with credit value...

How does it work..no balance in AUD but still it is posting revelaution values in USD...

Could you please suggest on this..

Thanks