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A temporary dataset, starting with a prefix of &&* and followed by a number, is used when the DSN keyword does not exist in the JCL DD statement.
In this case, the %%$DDDSN variable shows this temporary value.
Figure JV28 CTJVER output with temporary dataset - Example 13
4 //NDSNDEV DD DISP=(NEW,PASS),
// DCB=(LRECL=0080,BLKSIZE=3120,RECFM=FB,DSORG=PS),
// SPACE=(TRK,(0001,0001),RLSE),
// MGMTCLAS=TOTO
CTJDSIW 4 WARNING: SPECIFIED MGMTCLAS TOTO does not exist. DSN=&&*00000001
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