Change reseller for given client
 

Hi,
i couldn't find a way to switch a given client from a reseller to another. The only way is to delete the client and re-create it under the target reseller.
I would change the values directly into db, but i'm scared to make some mistake. Is there another way, or what are the exact tables/fields i have to look for to switch a client under another reseller?
Anyway, i think that should be a todo into ispconfig.
Thank you all in advance.
Dave.