I've taken a closer look at the entire problem and it seems to be an issue with veins_inet, if I use any set of sumo files in the veins_inet example the contents of the poly file are not displayed, inserting the previously discussed code regarding the annotations in this example will not change anything. Ive taken the sumo files form the veins example (erlangen) and inserted them into the veins_inet example, adjusted it, so they would be recognized by the .ini file and started the simulation, the roads were displayed but not the objects form the poly file.
I've been comparing the .ned and .ini files between the veins example where the contents of the poly file are displayed and the veins_inet example where they aren't displayed anymore without any success in fixing the issue. Am I the only one who has that issue or is that a general bug in veins_inet?