title: Reporting Services tablix will not allow me to freeze column header AND Rows
body: <p>Trying to modify an existing rdl RS report in Visual Studio 2017. It currently freezes the column header when scrolling down, but when I try freeze the four left-most columns so they will stay in view when scrolling right, I get an error that the report definition is invalid. We've successfully done this on another report, and as far as I can tell, the basic setup between the two reports is the same. The only difference I can see is that the report that works doesn't have any grouping on it. Is that the culprit? (I just started a new job... I will be more specific in details once I actually get my own system/logins/etc - it would seem that Higher Ed works a leeeetle more slowly that K-12! - I just wanted to see if there was a quick yes/no answer out there! PS: a "veteran" already gave up on this, so it would be super awesome to fix this as a noob in my new position! ;-))</p>