The block size for the SYSIN, SYSUT1, and SYSUT2 data sets must be a multiple of 80. Any blocking factor can be specified for these record sizes.

Any JES2 or JES3 control statement or JOBLIB DD statement that follows a selected JOB statement in the SYSUT1 data set will be automatically copied to the output data set. JES2 or JES3 control statements preceding the JOB statement are assumed to belong to the previous job. JES2 or JES3 control statements preceding the first JOB statement are included only if you request a total copy.

However, if the SYSUT1 data set is included in the input stream (SYSUT1 DD DATA) JES2 or JES3 control statements are included only if a delimiter other than "/*" is coded in the SYSUT1 DD DATA statement. If another delimiter is not coded, the first two characters of the JES2 or JES3 control statement will act as a delimiter and end the SYSUT1 data set.

Related reading: For more information about coding another delimiter, see z/OS MVS JCL User's Guide.