Previous indexed START or READ did not lock record

  Explanation:  When your program executes a REWRITE or DELETE statement
  for a file in sequential access mode, the current record must be locked.
  This message indicates that, for an indexed file, this condition was
  not met.

  User Action:  You must take the following actions:

      a. Verify that the previous START or READ statement that
         established the current record did not include an
         ALLOWING UPDATERS file sharing option.  This option does
         not lock the record.

      b. Check the program logic to ensure that there are no UNLOCK
         statements that unlocked the current record.