z/OS 2.1 here.  In trying the following example DELETE with a MASK operand from 
a TSO READY prompt, I get the same error no matter whether I use asterisk or 
double-asterisk as the MASK value.

I have not found any documentation of the MASK keyword in the online TSO/E 
Commands Reference for either z/OS V2.1 or z/OS V2.2, but TSO HELP DELETE 
yields the description that follows the example below, indicating that MASK is 
a valid keyword.

Where can I RTFM about the MASK operand please?

Peter

Example DELETE with MASK operand and TSO HELP DELETE:

READY
  DELETE    ('TSOUSER.TEST.DATA.*')  PURGE MASK
IDC3239I INVALID DELETE MASK KEY - '('TSOUSER.TEST.DATA.*')
IDC0014I LASTCC=12
READY
  TSO HELP DELETE

Function -
  The DELETE command is used to delete either VSAM objects or NONVSAM
  data sets from a VSAM or ICF catalog and to free space occupied by
  the objects or data sets. Also the free space of VSAM data components
  can be overwritten with zeros. The DELETE command also deletes
  GDG bases and VSAM USERCATALOGS.

Syntax -
         DELETE    ('entryname/password' ...)
                   CATALOG('catname/password')
                   FILE('dname')
                   PURGE | NOPURGE
                   ERASE | NOERASE
                   SCRATCH | NOSCRATCH
                   FORCE | NOFORCE
                   RECOVERY | NORECOVERY
                   MASK | NOMASK
                   CLUSTER | SPACE | USERCATALOG |
                       ALIAS | GENERATIONDATAGROUP | PAGESPACE |
                       NONVSAM | PATH | ALTERNATEINDEX | TRUENAME |
                       NVR | VVR | VOLUMEENTRY | LIBRARYENTRY
. . .
   MASK     - The entryname is a MASK filter used to select a range
              of catalog entries to be deleted.

NOMASK   - the entryname is the name of a catalog entry to be
           deleted.
. . .

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