When you're in advancement mode, be careful to purchase new items by double-clicking them or by using the Customize button (avoid using the add button and the add & close button) - once you've paid for it, you can't change the rating or specify details - the rating and the details might affect how much you were supposed to have paid for the item.
You'll have to sell that sustaining focus for full price and purchase a new one - while you're purchasing it, you'll be able to select whether it's for combat spells, detection spells, etc.
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