Space management (SPAM) pages should be rebuilt for
  logical area <str>,
  logical area id <num>

  Explanation:  The SPAM pages  for  the  indicated  logical  area
  should  be  rebuilt  since  the  logical  area thresholds and/or
  record length have been modified.

  User Action:  Use RMU/SET AIP /REBUILD_SPAM to rebuild the  SPAM
  pages   for   all   logical   areas   that  have  been  changed.
  Alternately, explicitly name the mentioned logical  area  id  or
  name on the RMU/SET AIP command to rebuild just that area.