Additional Part is "Tacet" [solved]

Hi, I’m working on a project where I’ve imported a piano part via a midi file, now I want to arrange a vocal line for it so created a Voice instrument in Setup. Now in Write mode when I select the Voice I just shows “Tacet” in a box. There are no bars or clefs and it doesn’t seem I can add one. What am I missing here?

Oh, I just figured it out - I had to check off the box of the new part in Setup mode!