Quote: (Steve54 @ 18 Apr. 2009, 13:00 )
I would say No - though the failed formation can still enter, but not perform an action, with a BM I believe
This was debated several times in the past. I believe the conclusion reached by the previous ERC was that it was the formation that was testing, not the Wraithgate itself so you can try again with another formation.
The formation that failed to activate would take a "Hold" action, so it could make a single move through the Wraithgate with a BM as Steve says (thus preventing another formation from entering later on), or it could stay put and remove the BM, allowing the player to try to bring a different formation through the gate later in the turn.