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Ground reference issues

Question asked by presario on Nov 15, 2006
Latest reply on Nov 20, 2006 by ALEPEREZ
I have a multilayer PCB tackup in momentum and I have two ports on my top most substrate. If I try to reference these ports to ground, it gives me an error that says 'Ground reference ports must be associated to an internal port or to a single port with same reference plane'What does this mean?
How can I succesfully reference these two ports to ground?