Hello Community,
'Nant', please explore more the Joomla, yes !!!
I could solved the problem, and is the next:
For remove the unique validation field 'username', but this is out of CB component and same time is need:
The file is user.php, and the route is:
libraries/joomla/database/table/user.php
Line 168
Comment the next code:
[code:1]
/*
if ($xid && $xid != intval( $this->id )) {
$this->setError( JText::_('WARNREG_INUSE'));
return false;
}
*/
[/code:1]
And ready, do to test, dupplicating the same value.