sde（oracle）中建featureclass出错

<P> 用程序（用engine开发的）创建了一个featureclass,名为polygoncontour20060912，结果报ora-00904无效的标志符（sde.polygoncontour20060912）,请问是什么原因啊？</P>

<STRONG>ora-00904 invalid column name</STRONG>
<P>　　ora-00904: 无效的列名</P>
<P>　　cause the column name entered is either missing or invalid.</P>
<P>　　action enter a valid column name. a valid column name must begin with a letter, be less than or equal to 30 characters, and consist of only alphanumeric characters and the special characters $, _, and #. if it contains other characters, it must be enclosed in double quotation marks. it may not be a reserved word.</P>
<DIV></DIV>
<P>　　<STRONG>原因:列丢失或无效列名。</STRONG></P>
<P>　　<STRONG>方案:输入有效的列名。一个有效的列名必须是以字母开头，小于30个字符，并且只包含字母、数字或一些特殊的符号$,_,#。如果还包含其它的字符，那么这段字符必须用双引号引起来。列名不能是关键字。</STRONG></P>