One can change station for a support line the following different ways:
You can select the SupportLine and open the Properties dialog and change the station value from SupportLine Rule section:
One could also select the SupportLine in view…
Normally this happens when your SupportLine is smaller than the width of the bridge. One should always make the SupportLine longer than the width of the bridge.
Here is an example illustrate the issue and resolution. Shorter SupportLine will cause the…