Can't re-enter flight number

[geoffda 27]

I entered the wrong flight number because I had inadvertently created a dispatch for the opposite direction flight. I corrected the dispatch but forgot to change the flight number that I had already written down. So I entered the incorrect flight number in both the flight plan page and the radio page. I discovered the error when I was doing the departure briefing. However, when I tried to re-enter the correct flight number neither the flight plan page nor the radio page would allow it. I typed the correct flight number in the scratch pad, but when I pressed the LSK to enter it, instead of overwriting I just ended up with a blank flight number. Not a biggie, but probably an easy fix for the next update...