How to avoid Optional Prompt Text

Hi Techies,

I have a optional prompt in my report defined at report level,

when I run the Query the Prompt text is shown as

Example:-

"Enter Values............(Optional):" {if this value is no selected then the filter will be ignored.}.

Now my question is how to avoid the text showing in curly braces as shown in the example above.

Please do the need full.

I am working on BO 3.1 and back end data source is Oracle 10g.

Thanks in Advance ...........