IPSec VPN with two mikrotik's

Hello, 

i am using my FortiGate 50E as IPSec vpn server to connect mikrotik, and everything looks good, but now i am tryng to connect second external location with another mikrotik router without success. Is there any specific setup on fortigate to be able to build two indipendent IPSec site to site VPN's with two mikrotik devices.