Adding new airport at database doesn't work

Is this a bug or I forget something?
I developed a new waterairport in Hawaii Kuhului and gave it the name OGGW. Then I tried to make an AI-flightplan from this airport. Of course there isn't such an airport in the airportbase of AIFP. So I tried to add the new one. Please see the attached pictures. You can see I came until the step you see at picture 5 where I had to klick on the 'Apply Update' button.

If I try the other way 'Find/Collect Airports' there is no problem.