docs: def _dasd_reverse_conversion(cls, val, **kwargs):
          '''
          converts DASD String values to the reg_sz value
          '''
          if val is not None:
              if val.upper() == 'ADMINISTRATORS':
                  # "" also shows 'administrators' in the GUI
                  return '0'
              elif val.upper() == 'ADMINISTRATORS AND POWER USERS':
                  return '1'
              elif val.upper() == 'ADMINISTRATORS AND INTERACTIVE USERS':
                  return '2'
              elif val.upper() == 'NOT DEFINED':
                  # a setting of anything other than nothing, 0, 1, 2 or if it
                  # doesn't exist show 'not defined'
                  return '9999'
              else:
                  return 'Invalid Value'
          else:
              return 'Not Defined'