Matching result	Required handling
Original 0100 / A authorization found	Treat the 0101 / A repeat as the same authorization. Return the original 0100 / A response. Do not apply duplicate balance, block/reserve, or ledger impact.
Original 0100 / A authorization not found	Treat the 0101 / A repeat as a new authorization request. Evaluate balance and business rules, then return the required authorization response.