RPG invocation (OPM)

     C*..1....:....2....:....3....:....4....:....5....:....6....:....7..
     C                     CALL 'exitname'
     C* Channel exit parameter block
     C                     PARM           MQCXP
     C* Channel definition
     C                     PARM           MQCD

Declare the structure parameters as follows:

     I*..1....:....2....:....3....:....4....:....5....:....6....:....7..
     I* Channel exit parameter block
     IMQCXP       DS
     I/COPY CMQCXPR
     I* Channel definition
     IMQCD        DS
     I/COPY CMQCDR