Multiple RDP Port Forwarding

We had a normal router, and we were using port forwarding, we connect from outside to many machines at the office using RDP, 

So for example:

If we connect from outside to WANIP:1111 it forwards to 10.0.0.1:3389

If we connect from outside to WANIP:2222 it forwards to 10.0.0.2:3389

Now we moved to Sophos XG115 (SFOS 17.1.3 MR-3),  so I need to create one service like this picture attached:

NOTE: I also tried with Source Port: 3389 (not a range)

In Firewall, I added a business Rule, See Next Image:

Licensing Machine defined:

Please notice that the second field of "Mapping Port" after the "to" is still disabled.

Also, as I understand I need to create a rule for each of the forwarding I am trying to do.

Hope you can tell me what I am doing wrong.