thanks again for your effort!
I am attaching my example (unfortunately in German...
). Its a complicated curtain wall made of Eternit panels.
I also used four panel classes for this curtain wall, as I need to use four different materials and I constructed the curtain wall manually. As long as the curtain wall has not a specific pattern I cannot use 300+ panel classes. That is why I need a different ID for every panel, I might add a couple of panels anytime depending on the design process, thus it is not feasible to adapt aproximately 300 IDs after every change.
Grigoris