why isn't my CHGLIBL working?

["Tim Truax" <truax@xxxxxxxxxxxx>]

Hello all,

I am trying to call the CHGLIBL from my CLP (testdta) in this manner:

** Beginning of data (testdta)  ******************
PGM
DCL        VAR(&LIST) TYPE(*CHAR) LEN(200)
RTVDTAARA  DTAARA(GNTDA001 (1 200)) RTNVAR(&LIST)
CHGLIBL    LIBL(&LIST)
ENDPGM
***** End of data ********************************

and it is failing with this error:

call testdta
Value 'TLTLIB    ' for parameter LIBL not a valid name.
Error found on CHGLIBL command.
Function check. CPF0001 unmonitored by TESTDTA at statement 1000,
  instruction X'0027'.
CPF0001 received by TESTDTA at 1000. (C D I R)
CPF0001 received by TESTDTA at 1000. (C D I R)

Heres the *DTAARA.

               Value
Offset          *...+....1....+....2....+....3....+....4....+....5
        0                'TLTLIB IMPOBJLIB IMPDTALIB MSTOBJLIB MSTDTALIB    '
       50                'SUSOBJLIB SUSDTALIB PRODPLIB  PT3OBJLIB PT3DTALIB '
      100                'PODDTALIB GPLLIB    DTALIBHST PRODDLIB  MKTDTALIB '
      150                'JOBACCT   CSVDTALIB CSVOBJLIB ROBOTLIB  QGPL      '
      200                '                                                  '
      250                '                                                  '
      300                '                                                  '
      350                '                                                  '
      400                '                                                  '

Suggestions as to why this is failing will be appreciated.
Tim Truax