18.104.22.168.2.2.3 Receiving a TXUSER_EXPORT_MTAG_EXPORT Message
If the connection state is Connection Active:
Set the connection state to Processing Push Operation Request.
Find the transaction object in the transaction table of the transaction manager by using the guidTX field from the message as the key.
If the transaction object is not found:
Send a TXUSER_EXPORT_MTAG_EXPORT_TX_NOT_FOUND message using the connection.
Set the connection state to Connection Active.
Otherwise, the message MUST be processed as an invalid message as specified in section 3.1.6.