Hi Omer, Hi Hunnain,
The Topic has been discussed multiple times on SCN. Doing a pre-search would have faster Resolution of your issues. Please always do a search on SCN first before you put your queries. Anyways, for your issue please check if there are some incomplete assets and whether there is incomplete depreciation psted for some assets. Also check the below mentioned links.
http://scn.sap.com/thread/2118868
http://scn.sap.com/thread/1571291
http://scn.sap.com/thread/3263829
BR
Amitash