3.2.5.3.5 Receiving a TXUSER_DTCLURMENLISTMENT_MTAG_TO_LU_BACKOUT Message
When the LU 6.2 implementation (section 3.2) receives a TXUSER_DTCLURMENLISTMENT_MTAG_TO_LU_BACKOUT message, it MUST perform the following actions:
If the connection state is Awaiting Transaction Outcome or Active:
Send a Backout request to the higher-layer business logic.
Set the connection state to Finalizing Abort Operations.
Otherwise, the message MUST be processed as an invalid message, as specified in [MS-DTCO], section 3.1.6.