[Roy Dennis]

Dave, I think that what gd123 is trying to point out is that it showed as if it was correct before adding the files, Not in Pink with the message (The selected field does not match). I can confirm that entering a blank space in that last field is what causes the truncated field.
The problem here for Dave the programmer as I see it is, up to that point it does match the field order, there might be a case where you want to enter a blank to define a field as I have in the past although not in that last field, so to make that report back as an error would be a problem if you intentionally entered a space.
I think although it might report back as correct you just have to accept that it can be tricked, the final result is seen after pressing the add button before importing so you do still know something is wrong before importing.