[phenixbb] how to convert .cif with multiple datasets

Dear phenix experts: I am using phenix.cif_as_mtz to convert a .cif file downloaded from pdb, but when I run ################################################ phenix.cif_as_mtz XXXX-sf.cif Sorry: Crystal symmetry is not defined. Please use the --symmetry option. ################################################ Then I run ############################################### phenix.cif_as_mtz XXXX-sf.cif --symmetry=XXXX.pdb Multiple data sets found => ignored: XXXX-sf.cif What should I do? Thanks for your help. Joe