Alter Tablespace DOE (z/OS): Impossible to change tablespace type (4333937)

Alter Tablespace DOE (z/OS): Impossible to change tablespace type.

Steps to reproduce the problem:

Create partition tablespace
1. CREATE TABLESPACE PARTANN6
  IN DSNDB04
  NUMPARTS 1(
    PARTITION 1      USING STOGROUP SYSDEFLT
        PRIQTY -1 SECQTY -1 ERASE NOyj
      FREEPAGE 0
      PCTFREE 5
      GBPCACHE CHANGED
      TRACKMOD YES
      COMPRESS NO )
  DEFINE YES
  LOGGED
  BUFFERPOOL BP0
  CCSID EBCDIC
  CLOSE YES
  LOCKMAX SYSTEM
  LOCKSIZE ANY
  SEGSIZE 0
  MAXROWS 255;

2. Open Alter Tablespace  DOE

Actual result:
Tablespace type is partition and impossible to change type