L5504AUX and toolkit

I have just completed a job where a retail BMS system is triggering a light scene on and off over CBUS via the Aux input unit. I have programmed the unit channel as a bell press and had some strange problems. I used trigger control to triggerf the scene on and off, however when using the trigger control application within the Aux unit it just wouldnt read the signal from the BMS. It was that bad that when you took all the signal cables out the LED would still be lit as if it was receving an On signal.

I changed the scene trigger group from trigger control application to a group within the lighting application, changed this within the AUX unit and it worked perfectly.

Is there a problem with trigger control application using the Aux unit???????