value prompt - passing null or some dummy value

[cognosun]

There is a optional value prompt with values in it...if users selects no value...is there any way to pass null value or any default value from it.

Also...we are using this prompt parameter in report query item, not in main filter.

[Gopinath]

Try using a prompt macro

#prompt('your promptname', 'datatype', 'default value')#