Reporting Services - credentials error.

Hi everyone.

I have created a report in RS and it works fine (am invoking from VB.Net - windows forms).

However, I have copied the report into a new one as I need a very similar looking report to be called from the same application, but if I attempt to invoke it in the same way as the first I get the following error:

"An attempt was made to set credentials for a data source '<name>' associated with thre report. Report data source settings are specified in a way that prevens credentials from being submitted to the report server."

I am passing the credentials like so:

Dim cc As New DataSourceCredentials
Dim cred() As DataSourceCredentials = {cc}

cred(0).Password = "*****"
cred(0).UserName = "****"
cred(0).DataSourceName = "**DSNAME**"

Any help would be gratfully recieved, as this is driving me completely nuts.

Thanks in advance.Anyone? Someone must have come across this before.

I am slowly banging my head against a wall here ;-)