There seems to be a recent change in ispconfig. /home/admispconfig/ispconfig/lib/classes/ispconfig_isp_kunde.lib.php in function kunde_insert() PHP: $username = $go_api->lng('Kunde').$doc_id; This leads to the problem that you can no longer set the webadmin_user via remote framework as it is overwritten with the above. I don't know when this appeard exactly but it wasn't there a while ago as far as I know. Thank you.
The issue is fixed in the remote framework, please see this thread for the update. http://howtoforge.com/forums/showthread.php?t=22087&page=2