SWIFT ISO 15022 - Code GTMO Meaning Good for the Month: Order that, if not executed, expires at the end of the month on which the order is entered. Usages Message type Field number Tag MT502 (Order to Buy or Sell) 18 22a (Indicator) MT513 (Client Advice Of Execution) 35 22a (Indicator) MT576 (Statement of Open Orders) 43 22a (Indicator)