Cost amt Act showing Positive Amt entry type sale

Hi,
We are working on Database Nav 4.0 SP3
We are facing problem in standard database.
Costing method is Average.
Scenario:
We had done sale for Item,
In value entry table Valued quantity showing correctly with negative sign
But cost amount actual shows amount with positive sign.(should show amount in negative)

if anybody is having solution on this, please revert back.