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Using the Budget Control System in US Fund
Accounting 
The Budget Control System (BCS) is the budgeting tool used to provide budget and availability control functions in Funds Management (FM).
Online transactions that incorporate funds and functional areas can be evaluated by the active availability control feature in BCS. Funds and functional areas entered in Controlling (CO) / Project System (PS) detailed planning are also copied to BCS budgeting.

For a full
description of BCS budgeting and availability control, including how to
configure BCS and how to migrate data if you previously used the old FM
budgeting function, read the
BCS
documentation.
When you activate Fund Accounting, configure CO transactions to be relevant to budget, and configure BCS active availability control, the online CO and PS transactions become subject to active availability checking.
You determine the CO and PS transactions you want to update on an actual basis in FM and make them relevant to budget by accessing the Implementation Guide (IMG) and choosing Public Sector Management ® Funds Management Government ® Actual/Commitment Update/Integration ® Integration ® Integration with Cost and Project Controlling ® Choose Business Transactions for Integration.
Online CO and PS transactions are processed by BCS active availability control. Although transactions performed using batch processes (allocation cycles, overheads, settlements) are not actively checked, they still reduce available budget.
Funds and functional areas entered in CO/PS detailed planning are used when the plans are copied to FM budgets.
