That's not how the d20 system works. Under standard d20, characters cap out at 20th level, and prestige classes only have 10 levels - in order to go higher, you need to use the Epic rules, which have a different save, attack bonus, feat, etc. progression.
I don't have any of the myriad supplements for the pen and paper Star Wars RPG, but in SW, it shouldn't really be an issue, since the most powerful iconic characters statted out in the basic book go no higher in terms of level than high teens.
Not that I mind that Sith Lords lets you go higher.
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Yes, i thought something was wrong with my statement, i was basing it on NWN and the Hordes of the Undrentide expansion, lets you goto lvl 40. But thats with an Epic class aswell.
So technically, even though no one has reached a cap, i think level 30 is the cap...we shall see if someone breaks that level.
-hutz