Availability Control 
Purpose
This component helps you monitor available funds.
When you execute the budget you can claim the assigned funds for expected expenditures via earmarked funds. Postings in the Funds Management feeder systems that refer to these earmarked funds establish commitments (such as purchase orders) and actual data (such as invoices and payments) is created. These forms of budget usage are collectively known as assigned funds.
As the person responsible for the funds, you can use the Information System to compare existing budget usage with the funds currently available. In addition to the funds overview in the information system, which acts as a "passive" availability control, the component provides functions that prevent budget overruns in the system.
Integration
Availability control influences the posting procedures in Funds Management - earmarked funds, funds transfers, budget transfers, supplements - as well as the posting procedures in the components integrated with Funds Management. For further information on which components are integrated with Funds Management, see Actual and Commitment Updating
When you enter an activity, such as a purchase order, which is assigned to a funds center and commitment item, the system checks whether the budget or released funds available are sufficient.
Note
If you use Controlling with Funds Management, availability control can be active both in Funds Management and in Controlling orders and projects.
You must therefore define clearly which task the availability control should have for orders and projects in Funds Management.
Features
With this component, you can fine-tune budget monitoring:
Availability control for revenues and expenditures
Availability control against releases (only for expenditures)
Execute availability control against annual budget or overall budget
Tolerance limits
Different behavior of availability control during commitment postings