Jump to mission script

[Kami-sama]

Eridan was too complex for now because of the multiple missions there as well as the permit to enter the system so I decided to try with Viper's final mission for a start. Here's what I tried:

do
SetQuestLabel("CurrentQuest","18a");
QuestStart("mission_18a");
Long_Jump("earth");
end;

No matter the order nothing happens after I jump to Earth. There must be more to it.