typeset in Korn Shell scripts

OK - I've beaten myself on this one to no end. I have a Korn script that uses
the 'typeset -l' command to translate a value into lower case. The script works
fine from the command line, from crontab entries, and also with at/batch
submission.

We have a system call from a compiled binary that calls this script and we get:

/usr/local/bin/cdfilesxfer2: typeset: not found

Here are the important parts of the script,which receives nine parameters:

#!/bin/ksh
# Received parameters debug
echo "PL part 3 = " $3
X2=$3
typeset -l X2
cp /$1/$2/print/$4/$5/1/$X1 /$1/$2/$X2/work/cdfiles/current/$7"."$8"."$9".wri"


I don't understand why it's not working, and I can't find anything in the ksh or
the typeset man pages about what turns it on/off. For now, I've replaced the
assignment of X2 and the typeset command with:

X2=`echo $3 | tr '[:upper:]' '[:lower:]'`

This works, but it's not what I wanted to do.

TIA,
-Sal
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