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M204.2623  JCL ddNames not allowed for GDG members; use DEFINE DATASET

A GDG stream must have its member defined by using the DEFINE DATASET command. This is because the command's specified DDNAME is reused for multiple data set names, but a JCL DD statement remains static for the duration of the run.

Message attributes:

RETCODEO=0Sets online return code
RETCODEB=4Sets batch (single user) return code
CLASS=EError class; the message can be suppressed with the X'04' bit setting of the MSGCTL parameter
AUDITMSWrites the message with line type MS to the audit trail
NOCOUNTDoes not increment the error count (ERCNT) parameter

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