Error Creating Web Service Connection

[Stuck]

Hi,

As I was trying to connect to a web service and entered a Sample Value I
received the following error message:

"The data contained a DataSet DiffGram which has a DataSet with a different
name than the associated schema indicates."

The thing is, if I type in any other value in the Sample Value, a value that
I know doesnt exist in the database ,I get a different error message.
I only get the error message above when I enter a valid value which really
exist in the database table.

Does this make any sense to anyone?

Thanks