Hi Carolina,
the documentation on the Format Converter looks a bit thin on the ground:
What might be easier, if the import isn’t going well, is to import the BMRB file into V3, then save the project as a NEF file (including CCPN tags) - shortcut EX. Open that in V2.5.2 and then create your peak list. You can then read your V2 project back into V3.
It could be that a few little things (like contour levels) get lost on the way, so if you wanted, you could open the V2 project in V3, export the peak list in NEF format and then read that back into your original V3 project.
Rather convoluted - I’m sorry. Will get working on things again as soon as I can!
Vicky