Some one ask me this question because it is possible with the essbase olap functionality .Is it the functionality of write back possible with cognos ?
Cognos is a brand of IBM, and has several products on the market, including Cognos 8, Cognos Express, TM1, Cognos Planning, Cognos Controller etc.
Some of them support writeback, such as TM1 and Cognos Planning (and the Xcelerator module of Cognos Express), and others such as Cognos 8 (and the Reporter module of Cognos Express) do not.
Hope that helps!
MF.