I am trying to create new report based on the OOB "Remaining Work" but have the report parameter "Work Item Type" default to a specific value other that "All (No Filter)"

I am working with the following out of the RDL

<ReportParameter Name="WorkItemTypeParam">

<DataType>String</DataType>

<DefaultValue>

<Values>

<Value>[Work Item].[System_WorkItemType].[All]</Value>

</Values>

</DefaultValue>

I cannot determine how to declare the "value" for the "Value" element.

I have tried a number of things like:

<Value>[Work Item].[System_WorkItemType].[Bug]</Value>

or <Value>[Work Item].[System_WorkItemType].[All].[Bug]</Value>

but when I render the report the parameter appears as a blank text box.

How do I define the default value for a report parameter to be one of the possible value of a dimension?

Thanks in advance

Tom