DataUtility for attribute display

Hi.

I have datautility to specify view for soft attribute.

I configured it by site.xconf

<Service name="com.ptc.core.components.descriptor.DataUtility" targetFile="codebase/service.properties">

      <Option serviceClass="MyDataUtilityClass"

              requestor="java.lang.Object"

              selector="attributeInnerName"

              cardinality="duplicate"/>

</Service>

This datautility works fine on "Type Attributes" panel in "Details" tab.

But it does not work on "Attributes" tab in "Structure" tab.

Why?

How can this problem be solved?

Thanks.