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Error when running Report with a second dataset calling a stored procedure to pass user details

Hi I receive an error:
System.Data.SqlClient.SqlException: SET CONTEXT_INFO option requires varbinary (128) NOT NULL parameter.

It occurs when running a report which users a second dataset. The dataset users the same trigger as the main dataset which works fine. I am using the second dataset to populate the Filter parameters.

The report actually runs ok if I run report in report  builder. However if I upload to Report Manager and run it I get the error above.

Any ideas on why this is occurring?

 It appears the Paramater @UserId might be null which is why I get the error. Is there something that stops the report from running stored procedures in the Parameters? Or an execution order which I need to change somewhere?

 FYI the Parameters populate ok if I don't use the Stored Procedure. E.g. The list is populated with 100 items. But if I use the stored procedure the list is reduced to 9. However if the Stored Procedure does not run then 0 will be returned. Hence why I think the error is that null is being returned.

But I need to stored procedure to run so I can populate the filter with appropriate user details rather than the full list.

I am hoping this is just something that I am doing wrong. E.g. Do I need to add an execution order to make sure the stored procedure executed before the parameters populate in the report?

Many thanks

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8/22/2022 - Mon