How to make parameters non-mandatory?

Hi, I am a noob to Discoverer. I've created a report with several parameters. Most of them accept default value of '%', but one of them not.
There's also a 'value required' string next to the field in IE (other fields do not have this). If I run the report, it runs ok only if there's something in the field listed.
As I've read on this forum, there should be an option to say, if the parameter is mandatory, or not. I don't see such option when creating a parameter. I use Discoverer Desktop 4.1.
Any ideas?

You could choose a number that is not in your result set (negative, decimal, or something large or small).
Another way would be to get rid of that parameter, and create a new one - but do not base the parameter on anything (choose <NONE> in the dropdown). Now, you can use '%' as a wild card, but you'll need to create your own condition:
   :newParam = '%'
OR to_number(:newParam) = myNumericItem

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