Domain & Client-Change
I noticed that there is needed several manual attention when updating a site-owner using ispConfig, as most of the configuration will not be updated with correct path-values.
So f.e. If you have a site "test.com" in ispConfig created for Client "Client1" and Web-User "web2" the whole configuration (incl. open_basedir) will be hard-configured for that site-record by copying the default-values of "system->server config -> web -> open_basedir values".
If you need to do an owner-change (f.e. mistake on creation) will mismatch all these values as all path are corrupt and owner-info in filesystem are wrong. Manual attention is needed while checking the vhost-config (apache), site-records open_basedir path's and of course correcting the user-info for the web-root (chown webx:clientx).
Why is there no automation? I think such an operation should be possible more comfortable. An owner change should correct all path values (vhost; open_basedir) and user-info in filesystem. For values such open_basedir I think it would be recommended to search/replace the old values/new values to keep user-added values untouched. This could be done by re-creating those values from "server-config -> web -> open_basedir", split the path values and do an search/replace on them with the new client-info.