Modify sync items type in existing partnership

[Andrea Vai]

Hello list,
I use msynctool to syncronize my data between a WM5 device and Ubuntu
Lucid. At the moment, the partnership is configured to sync

[Files Calendar Tasks Notes Contacts ]

(according to the output of
synce-list-partnershipssynce-list-partnerships).

But now I no longer need to sync the items of type "Files", so I would
like to remove that setting. How can I do it? Is there a command to
modify the partnership without deleting and recreating it?

Thank you,
Andrea