Hi,
According to me, you are I trying to tick the 'Negative Values' box in the Depreciation Area tab for a particular asset. Now this is recalculating the values in the asset for the previous year 2012. Kindly check whether fiscal year 2012 is open in the Asset Accouting. Can you please tell which is the closed Asset Fiscal Year for Asset in T-Code 'OAAQ'. For removing this error you need to either open the FI posting through OB52 T-Code or you need to closed the Asset Fiscal Year 2012 by AJAB and then make this asset allowed for negativce postings.
Regards,
Malhar.