Overhead % based on material group

HI ,

Is it possible to define % based on material group ? Currently I'm facing the requirement .

The OH % based on material type , e.g RM with 1% ; bought out SFG 0.5% can be achieved by OH key & group & costing sheet config and then maintaining OH group in MM. But the raw material type might have many groups and client wants different % material group wise .

I tried to achieve by configuring dependency / condition table / access sequence ; but material group option is not there . Is it possible to populate material group there in condition table ? OR any other workaround is available ? I don't think the COOM0001 user exit will help to achieve this ( not sure !!) .

Any help / guidance will be highly appreciated .

Regards

Indranil