Issue with i350 upgrade

[Rhus]

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Date & Time: 22-05 16:18
Frequency:
World name: Louisoix
Character name: Y'dyalani Rhus
Retainer name:
NPC name: j'tandhaa
Monster name:
Class/Level: Black Mage
Party or solo:
In-game time:
Area and coordinates: Rhalgrs Reach
Housing:
Steps:
1. When upgrading Black Willow Necklace of Casting to the Augmented Blck Willow Necklace of Casting the item cannot be equipped by casters as it is linked to Healer classes and stats are healer based (Piety aintelligence etc) Is there any way to undo this as I've just traded my caster necklace for the upgraded version that I now cannot equip to my Black mage
Edit: just looked and the Augmented Black willow Necklace of healing hs all Caster stats and is linked to BLM RDm etc. They're wrong way around.