How to pass Null Multiparameter value to subreport?

Hi Ryan,

Based on my test, there are two scenarios like below can cause this issue:

• If the value pass to subreport is not included in the parameter available values, we will get empty text box in the multiple parameter, and <Select a Value> in the signal parameter.
  


• If we pass blank value to subreport as the parameter, we can still get empty text box.
  
  So we can try to look at the URL of subreport in Report Server or Report Manager to double-check whether parent report had passed values.

The following screenshot is for your reference:

If there are any other questions, please feel free to let me know.

Thanks,

Katherine Xiong

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Katherine Xiong

TechNet Community Support