Does DDS SST keyword could not support variable length field ?

Dear all members,

        I am testing the Tracking Triggers  by Doug Eckersley from
Mcpressonline
  http://www.mcpressonline.com/mc?1@xxxxxxxxxxxxxxxxx@.6ae73ce8  on OS
V5R1 , and I could not compiled LF which contain variable length field. 

That LF contains some record as following:


      A          R MXTTTR                    PFILE(QADBXTRIGB)
      A            TFFILE             I      SST(DBXTBTNAME 1 10)
      A            TFLIB              I      SST(DBXTBTLIB 1 10)
      A            TTPGM              I      SST(DBXTBPGM 1 10)
      A            TTLIB              I      SST(DBXTBPGML 1 10)

        When I compiled it, I got the following error message: 

         CPD7616   : Keyword ignored because of error in list of values.
         CPD 7964 : Field on SST keyword must be character or zoned
decimal.

Those SST fields all are variable length filed, Does SST function could
not support variable length field ?

Best regards,

Vengoal