Hallo,
hier ein Auszug aus dem Redbook:

QSYS2* and SYSIB*: Libraries QSYS2* and SYSIB* are usually included in the
*ALLUSR list of libraries, so that their contents are included in *ALLUSR save
operations. However, because the programs in these libraries are replaced during an
upgrade, the ANZOBJCVN command does not check their contents when *ALLUSR is
specified.

http://www.redbooks.ibm.com/redpapers/pdfs/redp4293.pdf