Production BOM item after consuming shows Positive Quantity

Hi to All NAV Expert

I ask your assistance how I can trace or will know the reason what happen of Production BOM after the product considered as Finished product, its BOM item shows Positive quantity.

Wherein, the correct one it shows as Negative quantity. This happen when I check Prod BOM item by its ledger entries.

I’m just wonder what happen to NAV system since last 2012 transaction under consumption type, all quantity stated as Negative (or as deduction). This year 2013, it automatically change.

Please advice.