Hallo,
vermutlich liegt es an Deinem Script, denn da ein Sprung von R530 nach R710 gemacht wurde, beachtete man nicht die Änderung mit R540.

Hier aus dem Memo von R540:
FTP reply code changed

For V5R4, the FTP server was changed to return a reply code of 226
instead of 250 when a successful data transfer has been completed. This
made the FTP server compliant with RFC 959, which states that if the
data transfer connection is closed after a successful data transfer, the
reply code should be 226. If you have FTP scripts that are expecting the
250 reply code, you should change the scripts to expect a 226 reply code
for a successful data transfer.