addExists(subQuery) builds invalid SQL if subquery has orderby

Hi All,

I've got the following code:
===========Code===========
//build sub query
Criteria subCriteria = new Criteria();
subCriteria.addEqualToField("parentId", Criteria.PARENT_QUERY_PREFIX + "id");
subCriteria.addIn("someChildFeild", someCollection);

ReportQueryByCriteria subQuery =
QueryFactory.newReportQuery(Child.class, subCriteria);
subQuery.setAttributes(new String[] { "1" });
subQuery.addOrderByDescending("someChildFeild"); //******

//build main query
Criteria mainCriteria = new Criteria();
mainCriteria.addExists(subQuery);

ReportQueryByCriteria mainQuery =
QueryFactory.newReportQuery(Parent.class, mainCriteria);
mainQuery.setAttributes(new String[] { "id", "someParentFeild1",
"someParentFeild2" });
mainQuery.addOrderByDescending("someParentFeild2");

===========Generated SQL===========
SELECT A0.ID,A0.SOME_PARENT_FEILD1,A0.SOME_PARENT_FEILD2
FROM PARENT A0
WHERE EXISTS (SELECT 1, B0.SOME_CHILD_FEILD as ojb_col_2
		          FROM CHILD B0
		          WHERE (B0.PARENT_ID = A0.ID)
		                        AND  (B0.SOME_CHILD_FEILD IN (?, ?))
	                  ORDER BY 2 DESC)
ORDER BY 3 DESC
=================================
This SQL throws "ORA-00907: missing right parenthesis".

If we remove line marked with //****** we'll get:
===========Generated SQL===========
SELECT A0.ID,A0.SOME_PARENT_FEILD1,A0.SOME_PARENT_FEILD2
FROM PARENT A0
WHERE EXISTS (SELECT 1
		          FROM CHILD B0
		          WHERE (B0.PARENT_ID = A0.ID)
		                        AND  (B0.SOME_CHILD_FEILD IN (?, ?)))
ORDER BY 3 DESC
=================================
...which works fine.

Question: Should addExists(subQuery) check that subQuery doesn't have
any orderby added or it's up to developer?

Cheers,
  Vasily