Entering Settings For Availability Control 
Mandatory Customizing Settings
Maintain Budget Profile.
Maintain Budget Profile.
Specify Tolerance Levels For Availability Control.
Specify Tolerance Limits. Optional Customizing Settings
Exempt cost elements are cost elements that are not included in availability control (such as interest or credit notes for activities that were provided in a joint venture of a project for a partner project).
Choose the following in Customizing
Specify Exempt Cost Elements
Specify Exempt Cost Elements For Availability Control.