3.3.5.6.2 Receiving an XAUSER_XACT_MTAG_OPEN_NOT_FOUND Message
When the XA Superior Transaction Manager receives an XAUSER_XACT_MTAG_OPEN_NOT_FOUND message, it MUST perform the following actions:
If the State field of the receiving XA Transaction CMP Connection object is set to Awaiting Open Response:
Return XAER_NOTA from originating XA call.
Signal the Disconnect Connection event using the receiving Connection as the argument.