accdesc 语法错误 完全依照课本输入，请教高手错误在哪？

以下是程序：
proc access dbms=dbf;
accdesc= work.s000002;
create work.s000002.view;
select all;
list view;
run;

下面是日志：
20   proc access dbms=dbf;
21   accdesc= work.s000002;
     -------
     180
NOTE: Previous statement ignored due to parsing errors.
ERROR 180-322: 语句无效或未按正确顺序使用。
22   create work.s000002.view;
NOTE: Previous statement ignored due to parsing errors.
23   select all;
NOTE: Statement ignored, not valid for creating ACCESS descriptors.
24   list view;
NOTE: Statement ignored, not valid for creating ACCESS descriptors.
25   run;