Can you exchange tuvala sol to boss sol? If not, then here is your answer.
Imagine you are new player, you choose shai for your first character,you do all the quests and PA refuse to give you PEN Sol because??.... Lore > player expérience for PA...
They should make it, so shai can exchange it for a PEN Manos hoe with EZ enchant, as she is the lifeskill class afterall.