Remote controlling of VCA slider in Nuendo Mix

I would need to remote control a VCA fader on the Nuendo mixing console from the Allen&Heath iLive-T112 mixing console. My problem is that when I configure a new device in Remote control menu, I can detect incoming midi data and connect it to a virtual slide in the remote Controller window, but when I am trying to connect this data to a function to move some fader on the Nuendo mix console, nothing happens. When I connect it to a function like open import window it works, but it looks like as the incoming midi data from the console are in some strange format for moving a fader. Would anyone here be able to help, please.