Demimateria book issues

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Date & Time: 07/18/17
World name: Sargantas
Character name: Pemila Sirecloud


I have bought one Master book: Demimateria for weaver a couple of months ago and used it at that time. Now I am trying for other classes but trying to buy another gives me the error message of already having the unique item prevents me from buying another one. I checked on all my retainers and even used the Search option on each book but not a single Memimateria book in found on myself or my retainers. Is the demimateria book related to just 1 class only?

Edit: Found the issue after some more digging for a couple more hours. Sorry for taking anyones time.