Hi, When using the pick from root dialog, Assign Non-Root resonance sets the atom type for the CO correctly but doesn't assign it to the preceding spinsystem. If I remember correctly, I reported that behavior some time ago already. Am I still doing something wrong or is this a bug? Thanks for help, justin -- Justin Lecher Institute of Complex Systems ICS-6 Structural Biochemistry Research Centre Juelich 52425 Juelich, Germany phone: +49 2461 61 2117