Suggest Check Number when entering 11 Digits into the Registration field

When entering 11 Digits into the Registration field, trainlog could calculate the check number for the full UIC Registrtion (since it is but an algorithm) and suggest one. Additionally, Trainlog could give you a warning symbol or smth when the entered Check Number doesnt fit the Calculated one (maybe also show that warning in the trip list or include a way to search for trips with that warning so you can go back and edit trips where you may have entered it falsely)