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M204.2020  File fileName; condition​,​ OPEN command rejected

The Model 204 file could not be opened due to the condition indicated in the message.

Response: Check the name of the database file. If the name is incorrect, try again with the correct file name; if the name is correct, inform your System Manager.

System manager response: Check your JCL to ensure that the corresponding DD statement is pointing to a DASD data set. If the data set is allocated dynamically, be sure that ALLOCATE command points to a valid DASD data set.

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
AUDITERWrites the message with line type ER to the audit trail
COUNTIncrements the error count (ERCNT) parameter

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