DBFNTX/1023  Exclusive required

     Explanation:  The operation being attempted requires exclusive use
     of the database (.dbf) file but the work area was opened for shared
     access.

     Action:  Correct the program.  The PACK, REINDEX, and ZAP commands
     require exclusive access to the database (.dbf) file.  To obtain
     exclusive access, use the EXCLUSIVE clause of the USE command.

     See Also:  USE command, "Network Programming" chapter in the
     Programming and Utilities Guide