I noticed that one can manually define a 'Code' for a molecular system and the chains within upon creating them via the importing process. However, when you initially create them by hand it seems that the Name can be changed by hand, but that the Code is automatically created and can not be modified. Could you allow the Code to be manually defined during the manual creation as ell? Is it possible to manually change its value right now? (Note that the Code I mean is the system ID that is displayed in the spectra, assignment tables, etc: Molecular Systems are by default marked as MS1, MS2....; Chains are a,b,c,...) Patrick