The problem is:
When we execute 'create table' in PL/SQL , the filedname with double quotes(") and this filedname ends with 'USER', then error message "ORA-20401:Reject By Dbsec" is displayed .
but if the fieldname is not ends with 'USER' or delete double quotes of fieldname, then SQL can be executed successful!
However, it is strange : All of uppon SQL statement s can be executed in SQLPLUS!
Key Words: Error only in PL/SQL in some conditions
filedname with double quotes
fieldname ends with 'USER'( no ends, like 'ABCUSER01' is alway OK)