HI Friend,
It is possible. you need to create a new "Ethernat interface 1 port " profile for RAP 109 and shut down the ETH 1 port and map it.
In your case you are modifying default profile and which is by deault mapped to all the ports.
For your ref :
Here in this config, I have selected a specific AP and creating a new profile " Eth1_profile_rap1". in this profile port is shut down and mapped to "Ethernet interface 1 port configuration"
Please feel free if you need more clarity on this.