Что означает ошибка sendTransaction -- Не указан режим транзакции?

transaction = {}
    transaction.TYPE = "M"
    transaction.ACTION = "NEW_ORDER"
    transaction.ACCOUNT = accountId
    transaction.SECCODE = secCode
    transaction.OPERATION = "B"
    transaction.PRICE = tostring(lastPrice+500)
    transaction.TRANS_ID = tostring(ID + 1)
    transaction.QUANTITY = tostring(lots)
    
sendTransaction(transaction)