Why does the Data Set List Utility say no data set names were found when there are matching data sets?

In z/OS V1R2.0, ISPF added an Include Additional Qualifiers field to the Data Set List Utility (Option 3.4) panel. This field determines whether additional qualifiers are included in the search. For example, here are 12 data sets:

USER1.TEST.FILE 
USER1.TEST.FILE.DATA 
USER1.TEST.FILE.D0212.Y2004X
USER1.TEST.FILE.D1803.Y2004X 
USER1.TEST.FILE.EXPORT 
USER1.TEST.FILE.INDEX 
USER1.TEST.FILE.BACKUP 
USER1.TEST.FILE.DATA.BACKUP 
USER1.TEST.FILE.D0212.Y2004X.BACKUP 
USER1.TEST.FILE.D1803.Y2004X.BACKUP 
USER1.TEST.FILE.EXPORT.BACKUP 
USER1.TEST.FILE.INDEX.BACKUP

If Dsname Level is USER1.TEST and Include Additional Qualifiers is selected, all 12 data sets are listed on the DSLIST panel. However, if Include Additional Qualifiers is not selected, message ISRU517 (No data set names found) appears, because there is no data set whose full name is USER1.TEST.

If you want to search for more qualifiers than are listed in the DSNAME Level field, select Include Additional Qualifiers on the Data Set List Utility panel (ISRUDLP).

If you prefer not to select Include Additional Qualifiers, you can append the Dsname Level with a period followed by a double asterisk to get the same results. A double asterisk indicates that zero or more qualifiers can occupy that position. To a list with all 12 data sets, use

    Dsname Level . . . user1.test.**