I am getting the error below when trying to add a query from the Project Manager to my Query Builder.
Exception: System.Xml.XmlException
Message : Invalid character in the given encoding. Line 1, position 1.
Stack Trace:
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
You can add a subquery into the Query builder as long as you're in the Query tab and the cursor in set to where you wants to add the subquery, then it will work.
For example: