@StefanKottwitz OK, i give you the one why I ask: [Preview of “hyperlinks” in PDF [duplicate]](
tex.stackexchange.com/questions/160755/…) The already added link is added by me, but see my comment below or Torbjorn's. In rare cases it would be better, when one could give more than link to.
Oops while I am writing I read your update. But you could remove the duplicate state and then readd it. (just kidding)