Exception data sections

The exception data section contains a single exception record representing one exception condition.

The format of an exception data record (including the SMF header and SMF product section) is shown in Figure 1.
Figure 1. Format of an SMF exception data record
The picture shows an SMF exception data record consisting of an SMF header, an SMF product section, and an exception data section.
The format of the exception data section can be mapped by the DSECT MNEXCDS, which you can generate using the DFHMNEXC macro as follows: 
MNEXCDS DFHMNEXC PREFIX=EXC
The label ‘MNEXCDS' is the default DSECT name, and EXC is the default PREFIX value, so you could also generate the DSECT by coding 
DFHMNEXC

The MNEXCDS DSECT has the format shown in Figure 2.

Figure 2. CICS monitoring exception record DSECT
MNEXCDS  DSECT
EXCMNTRN DS    CL4                TRANSACTION IDENTIFICATION
EXCMNTER DS    XL4                TERMINAL IDENTIFICATION
EXCMNUSR DS    CL8                USER IDENTIFICATION
EXCMNTST DS    CL4                TRANSACTION START TYPE
EXCMNSTA DS    XL8                EXCEPTION START TIME
EXCMNSTO DS    XL8                EXCEPTION STOP TIME
EXCMNTNO DS    PL4                TRANSACTION NUMBER
EXCMNTPR DS    XL4                TRANSACTION PRIORITY
         DS    CL4                RESERVED
EXCMNLUN DS    CL8                LUNAME
         DS    CL4                RESERVED
EXCMNEXN DS    XL4                EXCEPTION NUMBER
EXCMNRTY DS    CL8                EXCEPTION RESOURCE TYPE
EXCMNRID DS    CL8                EXCEPTION RESOURCE ID
EXCMNTYP DS    XL2                EXCEPTION TYPE
EXCMNWT  EQU   X'0001'            WAIT
EXCMNBWT EQU   X'0002'            BUFFER WAIT
EXCMNSWT EQU   X'0003'            STRING WAIT
EXCMNPOL EQU   X'0004'            POLICY
         DS    CL2                RESERVED
EXCMNTCN DS    CL8                TRANSACTION CLASS NAME
EXCMNSRV DS    CL8                SERVICE CLASS NAME
EXCMNRPT DS    CL8                REPORT CLASS NAME
EXCMNNPX DS    CL20               NETWORK UNIT-OF-WORK PREFIX
EXCMNNSX DS    XL8                NETWORK UNIT-OF-WORK SUFFIX
EXCMNTRF DS    XL8                TRANSACTION FLAGS
EXCMNFCN DS    CL4                TRANSACTION FACILITY NAME
EXCMNCPN DS    CL8                CURRENT PROGRAM NAME
EXCMNBTR DS    CL4                BRIDGE TRANSACTION ID
EXCMNURI DS    XL16               RRMS/MVS UNIT OF RECOVERY ID
EXCMNRIL DS    F                  EXCEPTION RESOURCE ID LENGTH
EXCMNRIX DS    XL256              EXCEPTION RESOURCE ID (EXTENDED)
EXCMNNID DS    CL8                NETWORK ID 
EXCMNRLU DS    CL8                REAL LUNAME
         END OF EXCEPTION RECORD...

For further information about exception class data, see Exception class data, which lists all the system-defined data that can be produced by CICS monitoring.