指针

  You attempted to access an unassigned field symbol
  (data segment 32821).

  This error may occur if
  - You address a typed field symbol before it has been set wit
    ASSIGN
  - You address a field symbol that pointed to the line of an
    internal table that was deleted
  - You address a field symbol that was previously reset using
    UNASSIGN or that pointed to a local field that no
    longer exists
  - You address a global function interface, although the
    respective function module is not active - that is, is
    not in the list of active calls. The list of active calls
    can be taken from this short dump.