A report with  multiple value parameter and a string "select values" to be kept in the list control at the start up of the  report.

The report will be shown like below.

In Reporting Services, by default, the textbox displays”<Select a Value>” text before selecting values in a single parameter drop-down list. But nothing would be shown in the start up of  multivalue parameter list. This is by design.

To work around this issue, we can specify the Available Values from the batchId field in the following dataset:

select 'select any value' as batchId

union all

select distinct  CAST(batchId AS VARCHAR(1)) from  dbo.Table1  

Then specify the 'select any value' as the Default Values for the multiple parameter. In this way, we should change the values in the drop-down list when we render the report.