Answer Posted / srinivasa gudla

A RETURN_CODE shows the status of each step within a job and
the maximum RETURN_CODE is 256.

Return code - is issued by the program and can be set to any
value up to an arbitary limit (4096 I think). To know the
meaning of the return code you need to read the
documentation of the program / product / utility that is
being executed. i.e. RC16 from SORT does not mean the same
thing as RC16 from IDCAMS.

Abend / User completion code - are codes that reflect the
nature of the abend. System abends are documented by IBM,
user completion codes are the same as above for return codes.

Reason code - May or may no be used in conjunction with
abends codes.

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