Hi Raghavendra
your running the ck11n for which plan cost like product cost by order your using are product cost by period ,
if your using period they you need to maintain the production version in material master and for each Group wise for each material .
please check :
use the backflush option for the calucaution of WIP if your using period only for each group wise (preliminary costing) in materail master prodcution version.
and check the change routing also you need to check back flush tic .
and check with REM Profile in material master .
let me know forther...........
give me more inputs related to order OR period where this issue ur getting
Regards
srikanth