Adding to list in cl-program

Hi all

I am having some trouble adding to a "list" in a cl-program.

The job is :
Add an entry to the exsisting Supplemental groups (SUPGRPPRF) on
a user profile.

First I retrieve the exsisting entries from the user profile in to a field
:
     RTVUSRPRF  USRPRF(&USR) SUPGRPPRF(&SUPGRPPRF)

Then I try to change the profile using this statement :
     CHGUSRPRF  USRPRF(&USR) SUPGRPPRF(&SUPGRPPRF &NEWENTRY)
 but I get this error message :
   700 - CHGUSRPRF USRPRF(xxx) SUPGRPPRF('ENTRY1 ENTRY2'  NEWENTRY)
Value 'ENTRY1  ' for parameter SUPGRPPRF not a valid name.

the problem, as I see it, is that the program sees the exsisting 2 entries
as one entry.

can anyone help.

thanks in advance.

Lars Villadsen