Warnings are just there to have you double check things. If the warning doesn't apply to you, or you are sure you have the right information entered, then it's ok to ignore them.

I had the same warning in TT Standard. After the warning and before connecting to netfile this warning popped up. I chose "applies to me" and it took me to the question about selling a property owned for less than a year. The Yes/No choices were both blank, and it was a question I hadn't seen in the interview because I said I hadn't sold any property. It seems like a bug to me. If I haven't sold a property, then I haven't flipped a home either.