References to default OUTPUT JCL statements

A sysout DD statement makes an explicit reference in an OUTPUT parameter that specifies the name of an OUTPUT JCL statement.
A sysout DD statement makes an implicit reference when it does not contain an OUTPUT parameter, and the job or step contains one or more default OUTPUT JCL statements.
A sysout DD statement implicitly references all step-level default OUTPUT JCL statements in the same step.
A sysout DD statement implicitly references all job-level default OUTPUT JCL statements when the step containing the DD statement does not contain any step-level default OUTPUT JCL statements.
A sysout DD statement can explicitly reference a default OUTPUT JCL statement.