3.3.4.9.5 Roll Back a Transaction Using CONNTYPE_TXUSER_PROMOTE
The application MUST perform the following actions:
If the connection state is not Processing Transaction:
Return a failure result to the higher-layer business logic.
Otherwise:
Send a TXUSER_BEGIN2_MTAG_ABORT (section 2.2.8.1.2.1) message using the CONNTYPE_TXUSER_PROMOTE (section 2.2.8.1.3) connection.
Set the connection state to Awaiting Abort Response.