Based on what you've written it doesn't sound like you have any inventory at all so you shouldn't worry about the method used with it. If the amount entered was supposed to be 'supplies' then in the future you should enter it as a deduction for supplies.
You can keep the cost method for your inventory since you don't appear to have any. If you do have actual inventory then just tell the system that you received approval and change the inventory method to cash. Since you didn't actually use the inventory method last year, only had a data entry error, it will be no big deal to change it.
@Spike100
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