The correct format for using a here document would be something more like:

Code:

f_FTP_MVS()
{
	ftp -sinv $REMOTE_SERVER $REMOTE_PORT <<EOF
user $REMOTE_USER $REMOTE_USER_PASS
type binary
passive
$(cat $TMP_BATCH_FILE)
bye
EOF
}

But, the AIX ftp man page that I have access to doesn't include a -s option. And, if you're trying to use ftp to copy the content of the file named by the expansion of $TMP_BATCH_FILE from AIX to MVS, the correct way to do that would be something like:
put $TMP_BATCH_FILE
not catting a binary file into a here document.

Alternatively, you could use simple redirection instead of a here-document:

Code:

f_FTP_MVS()
{
	echo "user $REMOTE_USER $REMOTE_USER_PASS" > "$TMP_BATCH_FTP"
	echo 'type binary' >> "$TMP_BATCH_FTP"
	echo 'passive' >> "$TMP_BATCH_FTP"
	echo "put '$TMP_BATCH_FILE'" >> "$TMP_BATCH_FTP"
	echo 'bye' >> "$TMP_BATCH_FTP"
	ftp -sinv "$REMOTE_SERVER" "$REMOTE_PORT" < "$TMP_BATCH_FTP"
}

And, of course, unless the FTP protocol includes character set translations when moving from AIX to MVS... since AIX works in ASCII/ISO 8859-1/UTF-8 and MVS works in EBCDIC, you may also need a step somewhere to convert your ASCII requests and file contents into EBCDIC. One possible way to do that if you need to is with dd conv=EBCDIC or dd conv=IBM depending on which variant of EBCDIC is used on your target MVS system.