':param trader_id: The trader id who created the order
:param transaction_number: The number of the transaction created
:type trader_id: TraderId
:type transaction_number: TransactionNumber'

def __init__(self, trader_id, transaction_number):

    super(TransactionId, self).__init__()
    assert isinstance(trader_id, TraderId), type(trader_id)
    assert isinstance(transaction_number, TransactionNumber), type(transaction_number)
    self._trader_id = trader_id
    self._transaction_number = transaction_number
