You cannot activate a live map, if the coordinates of its reference point are identical to the coordinates of the network's reference point. The might be due to the following:
If the coordinates of the reference point of the live map are identical to those of the network's reference point and you try to activate a live map, the following message is displayed:
1. Confirm with OK.
2. Assign the reference points of the network and the live map (Mapping Vissim network to background position).
3. Check the coordinates in the network settings (Showing reference points).