FTP User Options - ERROR You have no permission for this domain.
Submit changes in the FTP User Options or switch back to FTP User Tab failed.
ftp_user_edit.php Line 96
if(!$parent_domain || $parent_domain['domain_id'] != @$this->dataRecord['parent_domain_id']) $app->tform->errorMessage .= $app->tform->lng("no_domain_perm");
If you're in tab "options" the field 'parent_domain_id' isn't set, only in tab "FTP-User". So you can't store any changes in "Options".