Assigning FM Acct Assignment to CO Acct Assignment 
Use
The link between master data objects in Funds Management and objects in Controlling has two functions:
Input Help
The assignment helps keep data entry work to a minimum when you are posting in the Funds Management feeder systems. The system derives the FM account assignment from the CO account assignment when you post. There is no need to enter one manually.
Posting Integration
The assignment is used to reproduce the cost view from costing accounting in Funds Management. This means you can trace internal cost accounting business transactions.
Integration
There are other assignments you can use to create links between the basis data within Funds Management and other components. For more information, read
Additional Account Assignments in Funds Management.Prerequisites
You must assign a controlling area to each FM area where you want to use this facility. You do this in the Enterprise Structure IMG. Choose the step Assign controlling area to financial management area. The documentation for this step contains more detailed information.
You can activate posting integration selectively for the relevant business transactions; you do this in the Funds Management IMG. For more information, see the step Choose business transactions for integration in the Funds Management IMG.
Features
You can then enter the following assignments:
So as to increase flexibility, you can make assignments to cost centers, orders, and WBS elements dependent on cost elements. You can also make assignments to groups (cost element groups and cost center groups) so as to make maintenance more efficient.