I'm getting this diagnostic and all W2 income is from Colorado and non from Alabama. I don't see a way to enter gross income on line 5B of AL Form 40. This appears to be a bad diagnostic.
I've got the same problem. CO wages, AL diagnostic. I can't find a way to clear the diagnostic. Info on AL form W2 shows wages allocated to "other states" and wages show up in column H. Nothing in column I. Nothing for wages on line 5b which is correct for my taxpayer.