VARPG - Using the ODBC Part to call an SQL Stored Procedure with parameters

We are using more and more SQL and particularly the SQL Stored Procedures.
They are quick and easy. I find them very handy and a great way to BLACK BOX
database transactions. I once created a program using the ODBC part in VARPG
to access DB2 data defined by the Client Access/400 ODBC driver, supplying
the SQL statement "Select * from lib/file". Now I wanted to try calling a
procedure "CALL lib/procedure ('12345678','1234567890', RSLT)". First I did
one without parameters and it works great. Next I tried to include a
parameter in the call, both with and without a colon (:) preceding the
variable that should return a result parm. I get SQL0312 error message -
variable RSLT not defined or not usable. I think I need to define/bind the
3rd parameter to variable RSLT but I'm not sure how. My code looks like the
excerpt below. Any of you VARPG gurus who've used ODBC know how to
accomplish this? Thank you very much. RF

Rick Flagler
Manager, Information Technology Projects
Timken Super Precision (MPB)
Keene, NH 03431
(603) 352-0310
+++++++++++++++++++++++++++++++++++++++++++++++ begin code +++++++++++

     DQuote            S              1A   inz('''')
     DRSLT             S              1A   inz(' ')
     C     PSB00011C0    BEGACT    PRESS         MAIN
     C                   If        %Getatr('Main':'ODBC':'Connected')=1
     C                   movel     *blanks       selall           50
     C                   eval      Selall =
     C*                            'call ricklib/hjprc01(' +
     C*                             quote + '12345678' + quote +
     C*                             ',' + quote + '211TA88888' + quote +
     C*                             ',' + quote + 'X' + quote +')'
     C                             'call ricklib/hjprc01(' +
     C                              quote + '12345678' + quote +
     C                              ',' + quote + '211TA88888' + quote +
     C                              ','  + ':RSLT' +')'
     C
     C*                  eval      Selall = 'call ricklib/hjprc02()'
     C     'ODBC'        Setatr    SelAll        'SQLQuery'
     C     'ODBC'        Setatr    1             'ExecuteSQL'
     C                   endif
     C                   ENDACT
++++++++++++++++++++++++++++++++++++++++++++ end code ++++++++++++++++++