PAT/NAT rule not working

[M.Allen]

Hi I am looking to create a PAT for an internal server which will use the /30 public IP of the Palo outside interface and port 16385 to be reachable. The below scenario:

PAT/static NAT towards the private IP of O-IntercomSRV-01 (the intercom server) using UDP port 16385 from sources OG-Parking-Intercom-Dest source port 16385.

O-IntercomSRV-01 - 192.168.1.9

OG-Parking-Intercom-Dest - O-Parking-Intercom-Dest-01 - O-Parking-Intercom-Dest-02 (public IPs)

Is this how I would set this up?

 

I am getting an error message when committing..

[M.Allen]

Can anyone advised on this, like hitting my head against a brick wall atm