3.6.5.2.2.3 Receiving a TXUSER_ENLISTMENT_MTAG_COMMITREQDONE Message
When the transaction manager receives a TXUSER_ENLISTMENT_MTAG_COMMITREQDONE (section 2.2.10.2.2.4) message, the transaction manager MUST perform the following action:
If the connection state is Awaiting Commit Response:
Otherwise, the message MUST be processed as an invalid message as specified in section 3.1.6.