running DSPOBJD from sql table function

I have an SQL table function that runs DSPOBJD to an outfile and then
returns that outfile as the output of the table function. The table
function works. But I get an info message CPD000D - Command *LIBL/DSPOBJD
not safe for a multithreaded job.

What does that message mean exactly? Can I mark the table function to tell
the system it will be running single threaded code?

here is SQL that runs the table function:

select a.objname, a.objsize, a.crtdate
from table(sql_dspobjd('audrcv*','qgpl')) a
where a.crtdate < current date - 10 days

Here is the table function:
CREATE OR REPLACE FUNCTION sql_dspobjd(
inName char(10),
inLib char(10) default '*LIBL',
inObjType char(10) default '*ALL')
RETURNS table ( libName char(10),
objName char(10),
objType char(10),
objAttr char(10),
objSize decimal(10,0),
textdesc char(50),
locked char(1),
damaged char(1),
crtDate date )
language sql
modifies sql data
BEGIN

declare vSqlCode decimal(5,0) ;
declare sqlCode int ;
declare cmds varchar(2000) ;
declare cmdsLx decimal(15,5) ;

DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
SET VSQLCODE = SQLCODE ;


-- run DSPPGMREF to outfile.
set cmds = 'dspOBJD obj(' || trim(INLib) || '/' ||
trim(inName) || ') objtype(' ||
trim(inObjType) || ') output(*outfile) ' ||
'outfile(qtemp/core0043o)' ;
set cmdsLx = length(trim(cmds)) ;
CALL QCMDEXC( cmds, cmdsLx ) ;


return
select a.odlbnm libName, a.odobnm objname,
a.odobtp objType, a.odobat objAttr,
a.odobsz objSize, a.odobtx textDesc,
a.odoblk locked, a.odobdm damaged,
date(timestamp_format(
case when a.odccen = '0' then '19' else '20' end
|| substr(a.odcdat,5,2) || substr(a.odcdat,1,4),
'YYYYMMDD')) crtDate
from qtemp/core0043o a ;

END