Reconstructing Availability Control 
In Customizing, you can start reconstruction of the assigned
values. You need to do so if:
You are introducing a new release
You have changed the settings for availability control in the budget profile
You have changed the tolerance limits for availability control
You have redefined exempt cost elements
You have changed the settings for updating order values on orders for the project
You suspect that there may be data inconsistencies, for example in objects from older releases, or after corrections were installed for budgeting / availability control.
When you execute this function, the system redetermines the assigned values for the selected projects. It also creates references to the budget carrying objects, and transfers the new settings for the budget profile to the budget table.