Hi!
In one of my sessions, there was a crashed ship tangled up in the trees. The player characters wanted to use the Force. (They're all Force-sensitive.) None of them had "Move", but they did have banked XP. One of them decided to purchase the "Move" power right then and there, and we just described it as the Force kicking in at the right time.
It made me realize that there isn't an explicit rule about *when* players can spend their XP. If there really is no rule about this, how do you handle it? The above example is plausible, but I'd find it odd if a character jumped in a gunner seat for the first time in his life, invested his banked XP--saved as contingency--into Ranged (Gunnery), and then picked off TIEs with ease. I mean, it could be a "Star Wars Moment", surprising the audience with that character's hidden talents, but still. It feels a bit meta when players save some XP "just in case".
Edited by Redwense