Paginated Report Builder - Cannot Allow Null for a Multi Value Parameter

[GrayMarshUK]

In the Parameter Properties in a Paginated Report if Allow null value and Allow multiple values are set then it reports an error saying "A multi-value parameter cannot include null values'

Speaking with a Microsoft representative it was statetd that this could be a bug! 

[v-xiaoyan-msft]

Hi @GrayMarshUK ,

A multi-value parameter cannot include null values. When deselecting option "Allow blank value ("")", Report Builder shows error "Please enter a value for the parameter 'XXX'. The parameter cannot be blank."

And remeber Use white space (' ') instead of empty string ('') as a label.

For original post ,you may refer to Issue with Paginated Report Optional Parameters (A... - Microsoft Power BI Community

Best Regards,
Community Support Team _ Caitlyn