hello Markus,
are you importing directly from the memory stick via FCP, or did you copy the media off the stick to the hard drive first.
if you copy to the hard drive first, the files are MP4 and final cut will not open them via XDCAM Trasfer.
the correct way is to put in the memory stick, import XDCAM via FCP and FCP opens XDCAM Transfer which will convert the MP4 clips to MOV and they will automatically show up in FCP.
If you have already imported the clips to your mac via XDCAM Transfer, then they are already MOV but you will have to import the clips to FCP as you would a regular MOV file, not using XDCAM import… but then i think you loose any metadata which would be retained if you did it the correct way.
at least this is what i understand.
cheers
Mark.