Rectification u/s 143(1)

Hi all,

 I have received a notice U/s 143(1), in which depreciation exp has been added back in the Income because I Have not mentioned the Assets in the Schedule as per Income Tax Act and not the depreciation also. and claimed the Depreciation in the P&L accounts. due to which it has been added back.

So my question is Can , I file a rectification against the Order or not.

If yes please guide me how to file the Rectification from the Site.