[No]Scan qualifier ignored for online full backup operations

  Explanation:  The [No]Scan_Optimization qualifier was  used  for
  an  online  full backup operation.  The purpose of the qualifier
  is to enable or disable  the  recording  of  the  identities  of
  regions  of  the  database that have changed since the last full
  backup.  However, this recording state cannot be changed  during
  an  online full backup.  In order to change the recording state,
  an  offline  full   backup   must   be   performed   using   the
  [No]Scan_Optimization qualifier.