virtual pins

No the pins are placed only to have some "test point" during a timing simulation. If I compile the lower level bdf of my project I can place this pins as "virtual pins2 and i have no change in simulation result on other pins with or without them. rising the level in the hierarchy this pina are obviously not assigned as virtual pin but it the simulation results change with those pins or without those pins. I really don't understand. For your information the project was developed on max plus II and early version of quartus on a APEX device and they did have any kind of problems.