Voucher relogin on slave server on pfsense 2.3 beta

[th112211]

Sorry for my bad English!
With pfsense 2.3 beta
I have two server with Voucher database synchronization.
The primary server can sync good to the slave server!
On the primary server, i generate a voucher and active it (with Disable concurrent logins and Enable Pass-through MAC have been checked)
But on the slave server, this voucher can be actived again!
The problem is the user on the primary server gives his voucher to the user on the slave server and uses again?
So how do i block the voucher when it has been actived one the primary server and can't be actived again on the slave server?
Thanks!

[th112211]

Anyone please help me!