That's just a reminder - warning type message. It's going to put however harmonies you've chosen sequentially depending on the track you choose in the beginning with track # box. If you put in track 25 and you have picked three harmony parts it will put one on track 25, the next on 26 and the next on 27. Just make sure you type in a track number with enough open tracks below to hold the number of parts you've chosen and it will work fine.

Josie