Is budgetary control (check funds) applicable to an expense report in the expense module?

Summary:

Is budgetary control (check funds) applicable to an expense report in the expense module?

Content (required):

A budgetary control supplemental rule was created for the expenses module at absolute level without exceptions, when making an expense report that exceeds the accounting combination funds available, when auditing the report a "funds over treshold" warning appears, even so the audit can be concluded and pass the transaction to the AP module.

Why is the absolute control rule allowing the transaction to continue, why is it not stopping the transaction in the expenses module if there are no funds available?

Thank you!