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All business transactions are assigned to a transaction group in availability control.
You can define an action that the system is to execute if a transaction were to use too many assigned funds.
For more information, see
For the following transaction groups, you can define tolerance limits for different actions in each budget profile. To do so, in Customizing:

Postings to project orders are checked in the relevant transaction group, for example a purchase order from a project order is checked in the purchase order transaction group.
