Annual budget Vs Current Balance (Negative)

Hi all,

I have imported budget in Ax 2009. And when i generate Annual budget report which shows the difference between Current Balances and Budget Amount ( Formula for variance is Current Balance - Budget Balance ). But when the current account balance is in negative then the variance is calculated as ( - Current balance - Budget Balance ., i.e -2-4 = -6 ), which is totaling the amount instead of showing the difference.

in this case what i should do. ? Is there any option to ignore negative sign for current balances. or any customization is needed ? Or any more information is appreciated.