I am using a common report created in Telerik Reporting Designer.
The report has several multivalue parameters. All of them has "AllowNull" = TRUE (and AllowBlank=True also, just to be sure).
When the report loads for the first time, it works ok - all parameters pass empty to SQL and complete report is created.
But - event there is not change in parameters area, I cannot use Preview button - all multivalue parameters announces incorrect value.
I have to use Sellect All option and Deselect all option ... in all multivalue parameters. And after that Preview button is available
in HTML5 version I miss "Null" checkbox in case of parameters with AllowNull = True
Can you please recommend me, hot to proceed with this situation?