I haven't read through the above replies to check, but has anyone received the below error ONLY when the SP is executed against a CS collated DB? e.g. "SQL_Latin1_General_CP1_CS_AS"...

Well, after 7 years of SSRS development, the sophistication, fine-grain controllability, and user friendly options is DECREASING, not increasing. My only conclusion by now is that the only...

When I found your post above, I was glad that I wasn't the only one with the same exact error message. Also, when you search on Error 7399, 7421,...