115 JB - UNABSORBED DEPRECIATION as per Books of Accounts?

CA Nischal Agrawal (CA & Information Technology)   (96 Points)

26 October 2009  

115jb requires adjustment of unabsorbed loss or unabsorbed depreciation whichever is less ( As per books of accounts)

My query is what is considered as books of accounts ?

1) if books as per company act schVI etc - then what would be unabsorbed depreciation ? since there is nothing in company act wrt to unabsorbed depreciation

or

2) if books as per income tax .