Hello,
The comments about Net0 are correct. We do not allow multiple Net0 objects to connect to each other which would be bad since unused pins in a part are Net0 and you would not want to connect them all together.
In the end you need to create a real Net for this. You could use an existing net or the option to create unique Net0-X nets (in the project integration dialog used during Forward Annotation) which would allow you to connect lets say Net0-5 conductive shape with another Net0-5 Via/Trace because this is how we support fanout of unused pins in parts for testing.
Regards,
Jerry Suiter
Product Marketing Director Xpedition