showing a custom attribute in the workitem form

I'm looking at the Jazz 0.6 Milestone New and Noteworthy document, and we found some information about custom attributes representation. Basically the document says we need to add the following xml fragments to the process configuration file:

<static-configuration-data id="com.ibm.team.workitem.configuration.workItemTypes" xmlns="http://com.ibm.team.workitem/workitemTypes">

.....

			<customAttributes

   				category="com.ibm.team.workitem.configuration.workItemType">

				<customAttribute

					id="lowerEstimate1"

					type="string"

					name="Lower Estimate1"

				/>

			</customAttributes>

		</static-configuration-data>

	

		<static-configuration-data

			id="com.ibm.team.workitem.ui.editor.configuration.layout"

			xmlns="http://com.ibm.team.workitem.ui.editor/layout">

			<customAttributes>

				<customAttribute

					attributeId="lowerEstimate1"

					target="com.ibm.team.workitem.ui.editor.details.assignment"

				/>

			</customAttributes>

		</static-configuration-data>

However, we have some trouble making the attribute show up on the workitem page -- the attribute is created, but it doesn't seem to get added as a custom attribute of the workitem. Does anybody know what's wrong?

Thanks very much!
Annie