How to Set a defoutl value in a Report with As-Of Date Prompt

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Hi Guys,

I have realize a Dashboard with a report with As-Of Date Prompt by adding: "SET VARIABLE PARAM_EFFECTIVE_DATE='@{AsOfDate}';" in Prefix. When I open It, the system give me an error because there is no default value. How can I solve it?

I Just try to add a default data in the filter, but the system give me the error in the screen below:

If I insert a data in Assignment Start Date ( mm.dd.yyyy) the report work well. So, I think is a problem of the default values. Can Someone helps me?