Thanks for you post, that's what I do exactly, I stack up to 98% and use that two extra points to get 2% accuracy.

I'm not sure I understand that 98% accuracy thing, can you explain it? Cause from what I see, I need to have at least 100% accuracy.

Thank you so very much! Now I finally know why this is happening... already sent a bug report in game.

I've uploaded a screenshot of this issue. Still don't have any idea why this is happening. http://duke8253.com/artifice.jpg

But I've already learnt some other things that requires artifice lv240, like color crystal. Only the things in "mod" section can't be trained...

I've got my artifice to lv260, but when I tried to learn how to make a mod, which requires artifice lv240, the system keeps telling me "You do not have the appropriate crew skill". Does anyone knows why? Thanks!