I have a Dataflow in Fabric that connects to an on premise SQL Server and last week it was working and this week I am getting this error: Error Code: 999999, Error Details: Couldn't refresh the entity because of an issue with the mashup document MashupException.Error: The value is not updatable. I got this error yesterday morning and had the data gateway updated yesterday afternoon in case this was the issue, but I still get the error. The previous version of the gateway was only installed 2 weeks ago. The current version of the gateway is 3000.198.9. When I view the output in Dataflow it looks ok and is able to refresh. Also there are no errors in the data.

Hi - we were receiving the same error but can confirm that this has gone away with the latest update for the November gateway - version 3000.198.17 (November 2023) released on 11/16/2023. Hope this helps rather than having to downgrade to a September version. This version can be found here: https://www.microsoft.com/en-us/download/details.aspx?id=53127