JCLCM0209S job-number job-name DISP=NEW, UNCATALOGED DUPLICATE EXISTS - DDNAME

The specified DD statement specifies DISP=NEW but the data set name specified already exists in the catalog (in an uncataloged state).

Resolution:

This condition can arise when DISP=(NEW,KEEP) or DISP=(,UNCATLG) is specified or implied. Select the Catalog View, check the Show uncataloged datasets check box, and review the entries listed. Delete the duplicate data set entry in the catalog, or correct the disposition or data set name in the JCL as appropriate.