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When we execute 'create table' in PL/SQL Developer , 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' even (") exist or delete double quotes of fieldname only, then SQL can be executed successful! However, it is strange : All of uppon SQL statements can be executed in SQLPLUS! Detail in this link: https://community.oracle.com/tech/developers/discussion/4483747/ora-20401-reject-by-dbsec-error-in-pl-sql-but-not-in-sqlplus