Translation differences

Hello guys,

During translation to Group currency, the system proposes to post the differences depending on the sign of the diffrence (I am not talking about rounding):

To one account for the debiting diffrences and to another account for the crediting one. The sum of these 2 accounts equals the total difference...

I want to define the account depending on the sign of the total difference (if the total difference is a credit post to account A and account B if the total difference is a debit).

Do you know whether this is possible?

Thank you in advance for your help,

PascaL