I was hoping that somebody with a bit more knowledge than me might reply to this so I could learn too! No luck, so just a few thoughts that won't help but might explain.
I don't recognise the asset by its Kuid number but I have had some experience with Protrain Perfect which is Trainz adapted for the German market and, presumabaly, sold under licence. Is the departure board you mention one of their assets - a blue rectangular screen which enables you to imput track number, time, destination, class of train and so on? If so it may only work correctly through the Ebula computerised timetable (that's the one that gives the in-cab display of timetable, kilomentric distances, speed restrictions and so on). Ebula is a key feature of PTP which isn't in Trainz and needs to be used, not only for sequential destinations displays but also correct signal aspects and even to make speed restriction signs active.
Unfortunately my tecnical German isn't up to getting to grips with all the PTP instructions on the subject.
Best of luck and, if there'e anybody out there who knows a lot more than me, please shout.
Alan