Difference in ABST2 (accum. depreciation in asset balance bigger than gl balance)

Dear Experts,

Really need your help. We are facing problem which is in report ABST2 amount of accumulated depreciation in asset balance (1st LC AA column) bigger than accumulated depreciation in gl balance (1st LC Bal. GL column). We already checking in FBL3N there is no manual posting. Our questions are :

1. How to know which asset number that affected variance/difference in ABST2?

2. How to posting adjustment?, because we analyzed that if we posting adjustment through asset number tcode, difference must be still exist in ABST2.

Actually we are on audit interim , so this issue must be closed maks on Oct 31, 2014.

Thanks in advance

Best Regards,

Meita