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Cancellation of Contract

An amendment for the Cancellation of Contract reason carries only the single date (write date) field, and works by offsetting the original issuance. Example
If the item supply cost of the original tax invoice is negative, a Cancellation of Contract amendment is not allowed.

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Change in Supply Cost

An amendment for the Change in Supply Cost reason carries, as items, how much (+) or (-) the amount changed relative to the original. For example, if you overstated an item’s unit price by KRW 1,000, you issue it as -1,000.
The item input limits for a Change in Supply Cost amendment are the same as for standard issuance. There must be between 1 and 16 items, and the item specification (items[].specification) is up to 60 characters. You must also pass the tax type (taxType), and the tax (items[].tax) input rules are the same as for standard issuance.

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Calculation example

Original tax invoice Change in Supply Cost amendment invoice (carrying the difference) Final transaction amount

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Double Issuance by Mistake

An amendment for the Double Issuance by Mistake reason is called without any additional request parameters, and works by offsetting the original issuance. Unlike Cancellation of Contract, you do not pass a write date separately; the write date of the original tax invoice is applied automatically. Example