Hi, wwpdb onedep recently rejected a file that I had manipulated (but not validated, I admit) in IOTBX. The error was "duplicate categories", or a similar complaint. I had added _reflns.* items related to data processing to a phenix.refine cif file that already included a _reflns.B_iso_Wilson_estimate. Merely running sort() on the relevant block made the error go away, but who knows what side effects there may have been. Does the CCTBX ecosystem provide some higher-level management of cif categories? Thanks. Wolfram