Deriving the Functional Area
To sort expenses according to corporate functions, the system derives the functional area for the following postings:
· Primary postings (postings in Financial Accounting) to a profit and loss account
· Secondary postings (allocations in Controlling)

The functional area is derived for both objects involved in the allocation.
In the following cases, no functional area is derived:
· Postings to balance sheet accounts
· Entry of statistical key figures in Controlling
To enable the system to derive the functional area for a posting, cost of sales accounting must be active for the company code in which the posting is performed. For more information, see Activating Cost of Sales Accounting.
The system derives the functional area during document entry based on the information in the coding block. The functional area appears on the entry screen.
It is derived as follows:
...
1. From the master records of the assigned objects
If an object is assigned during a posting, the system checks whether a functional area has been entered in the master record of the object. The system retains this functional area provisionally.
2. From the master record of the G/L account or the cost element
The system checks whether a functional area is entered in the master record of the cost element or the profit and loss account. This functional area overwrites the functional area derived from the assigned object.
3. Using substitution for the component Financial Accounting, event 0006. If a functional area has already been determined, this is overwritten with the functional area obtained via substitution.
Definition of a substitution is necessary in the following cases:
¡ If you cannot enter a functional area in the master data of an object such as business process or real estate objects.
¡ If you want to define exceptions where the system should not derive the functional area from the object.

If you remove the indicator Determine Functional Area on Entry Screen in Customizing (Financial Accounting (New) → Financial Accounting Global Settings (New) → Tools → Customer Enhancements → Enhance Determination of Functional Area), the system does not derive the functional area until you have saved the document. Consequently, it is only visible once you have saved. The system derives the functional area via substitution for the component Financial Accounting, event 0005.