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z/OS MVS JCL Reference
Cataloged and in-stream procedures can invoke other procedures (up to 15 levels of nesting). In a procedure, an EXEC statement can invoke another procedure, which can contain an EXEC statement to invoke another procedure, and so on.
Note that an in-stream procedure cannot be defined within another procedure. The sequence PROC, PROC, PEND, PEND is not valid.
Copyright IBM Corporation 1990, 2014