title: DBMS LOB.SUBSTR Throwing ORA-00904: Invalid Identifier Error
body: <p>One of our cutomer is running the scripts in oracle sql developer to upgrade his database table structure, procudere &amp; triggers etc. But while running the script, he is getting <code>ORA-00904: Invalid Identifier Error for DBMS_LOB.SUBSTR()</code> and <code>DBMS_LOB.GETLENGTH()</code> in one procedure. </p>
  
  <p>Can somebody tell why is happening so?</p>
  
  <p>There are using Oracle Sql developer Version 3.1.07 Build MAIN-07.42 with Oracle 11g.</p>