You might have received this error message if you followed these steps:
You see the following error message (the path under the white box is the path to the XSD that has been created when you inserted the DataSet):
When you install BizTalk, there is a component called "BizTalk developer tools". This component contains all the logic to integrate with Visual Studio .NET 2003: pipeline designer, BizTalk Explorer and among many other things, a schema editor.
The error you are seeing is because the BizTalk Editor is trying to edit a DataSet schema and got confused. To workaround this, you have to ensure that DataSet schemas are opened with the Visual Studio Schema Editor and not the BizTalk Schema Editor. Here are two different workarounds:
Ravi, I hope this page helped you in case you missed my answer in another group.