3813248 - How can I create an audit rule for Air locations in Request?

I set up in the test environment an audit rule that should be triggered when employees of company XX enter an air route Milan - Rome. The problem I am encountering is that although I have put various combinations ( e.g. Milan-Rome, Linate-Ciampino etc..) the rule is triggered only when I enter the names of the cities and not airports.

Articles covers a system design limitation regarding Airport locations in Request. , KBA , CON-EXP-ADM-AUR , Audit Rules , Problem