code: def update_experiments(self):
          
          # 693 Remove if 'not applicable'
          for field in record_get_field_instances(self.record, '693'):
              subs = field_get_subfields(field)
              acc_experiment = subs.get("e", [])
              if not acc_experiment:
                  acc_experiment = subs.get("a", [])
                  if not acc_experiment:
                      continue
              experiment = acc_experiment[-1]
  
              # Handle special case of leading experiments numbers NA-050 -> NA 50
              e_suffix = ""
              if "-NA-" in experiment or \
                 "-RD-" in experiment or \
                 "-WA-" in experiment:
                  splitted_experiment = experiment.split("-")
                  e_suffix = "-".join(splitted_experiment[2:])
                  if e_suffix.startswith("0"):
                      e_suffix = e_suffix[1:]
                  experiment = "-".join(splitted_experiment[:2])  # only CERN-NA
  
              translated_experiment = self.get_config_item(experiment,
                                                           "experiments")
              if not translated_experiment:
                  continue
              new_subs = []
              if "---" in translated_experiment:
                  experiment_a, experiment_e = translated_experiment.split("---")
                  new_subs.append(("a", experiment_a.replace("-", " ")))
              else:
                  experiment_e = translated_experiment
              new_subs.append(("e", experiment_e.replace("-", " ") + e_suffix))
              record_delete_field(self.record, tag="693",
                                  field_position_global=field[4])
              record_add_field(self.record, "693", subfields=new_subs)
docs: Experiment mapping.