Slavisa,
There are some limitations in CO Budgeting in comparison with FM Budgeting:
1. If using WBS or Internal Order budget, you can only define a total budget for an object and not a budget by cost element.
2. If using CO Planning, there is no standard check while posting against a plan.
You can have a CO Object appear in FM commitment and actual tables but budgeting against a CO Object is not possible in FM.
Thanks
Shyam