You tried to append to a server file while the SUBSYS parameter was configured. Appending to a server file is not supported when the SUBSYS option is configured.
ftp> type I
ftp> site subsys=bp01
ftp> append 'user.data' 'user.output'
504 SUBSYS parameter not supported for APPE command
The file transfer fails.
Not applicable.
If you intended to use the SUBSYS parameter, and your client is the z/OS® FTP client, use the PUT subcommand instead of the APPEND subcommand to send the file to the server. Otherwise, send a SITE command that specifies the SUBSYS parameter without a subsystem name to the FTP server to disable subsystem processing. See the information about the PUT subcommand and the SIte subcommand in z/OS Communications Server: IP User's Guide and Commands .
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