RFXcom and Mysensor serial gateway

Hi
I have a Vera Lite UI7
I use a USB HUB to where I want to run my RFXcom and Mysensor serial gateway how I told Vera that there are two ports in use
The system keeps saying I need to set the seriale port
but when I set RFXcom so says the system that I skjal put Mysensor and vice versa

/Jan